[ { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/hkka0-s0y04", "eprint_id": 56557, "eprint_status": "archive", "datestamp": "2023-08-22 12:26:01", "lastmod": "2023-10-23 15:33:23", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Shaw-J-H", "name": { "family": "Shaw", "given": "John H." } }, { "id": "Plesch-A", "name": { "family": "Plesch", "given": "Andreas" } }, { "id": "Tape-Carl", "name": { "family": "Tape", "given": "Carl" }, "orcid": "0000-0003-2804-7137" }, { "id": "Suess-M-Peter", "name": { "family": "Suess", "given": "M. Peter" } }, { "id": "Jordan-T-H", "name": { "family": "Jordan", "given": "Thomas H." } }, { "id": "Ely-Geoffrey", "name": { "family": "Ely", "given": "Geoffrey" } }, { "id": "Hauksson-E", "name": { "family": "Hauksson", "given": "Egill" }, "orcid": "0000-0002-6834-5051" }, { "id": "Tromp-J", "name": { "family": "Tromp", "given": "Jeroen" }, "orcid": "0000-0002-2742-8299" }, { "id": "Tanimoto-Toshiro", "name": { "family": "Tanimoto", "given": "Toshiro" } }, { "id": "Graves-R-W", "name": { "family": "Graves", "given": "Robert" } }, { "id": "Olsen-Kim", "name": { "family": "Olsen", "given": "Kim" } }, { "id": "Nicholson-C", "name": { "family": "Nicholson", "given": "Craig" } }, { "id": "Maechling-P-J", "name": { "family": "Maechling", "given": "Philip J." } }, { "id": "Rivero-C", "name": { "family": "Rivero", "given": "Carlos" } }, { "id": "Lovely-P", "name": { "family": "Lovely", "given": "Peter" } }, { "id": "Brankman-C-M", "name": { "family": "Brankman", "given": "Charles M." } }, { "id": "Munster-J", "name": { "family": "Munster", "given": "Jason" } } ] }, "title": "Unified Structural Representation of the southern California crust and upper mantle", "ispublished": "pub", "full_text_status": "public", "keywords": "velocity structure; fault models; southern California; tomography; seismic wave propagation; strong ground motions", "note": "\u00a9 2015 Elsevier B.V. Received 18 August 2014, Revised 15 January 2015, Accepted 19 January 2015, Available online 4 February 2015. Editor: P. Shearer.\n\nThe authors thank Walter Mooney, Peter Shearer, and an anony-mous reviewer for constructive comments that helped to im-prove the manuscript. This work was supported by the Southern California Earthquake Center, the National Science Foundation, and the U.S. Geological Survey. SCEC is funded by NSF Cooperative Agreement EAR-1033462 and USGS Cooperative Agreement G12AC20038. This work was also supported through NSF awards EAR-1226343 titled \"Geoinformatics: Community Computational Platforms for Developing Three-Dimensional Models of Earth Struc-ture\" and EAR-1349180 titled \"Community Computational Plat-forms for Developing Three-Dimensional Models of Earth Structure, Phase II.\" The SCEC contribution number for this paper is 2068.\n\n
Supplemental Material - mmc1.pdf
", "abstract": "We present a new, 3D description of crust and upper mantle velocity structure in southern California implemented as a Unified Structural Representation (USR). The USR is comprised of detailed basin velocity descriptions that are based on tens of thousands of direct velocity (Vp, Vs) measurements and incorporates the locations and displacement of major fault zones that influence basin structure. These basin descriptions were used to developed tomographic models of crust and upper mantle velocity and density structure, which were subsequently iterated and improved using 3D waveform adjoint tomography. A geotechnical layer (GTL) based on Vs30 measurements and consistent with the underlying velocity descriptions was also developed as an optional model component. The resulting model provides a detailed description of the structure of the southern California crust and upper mantle that reflects the complex tectonic history of the region. The crust thickens eastward as Moho depth varies from 10 to 40 km reflecting the transition from oceanic to continental crust. Deep sedimentary basins and underlying areas of thin crust reflect Neogene extensional tectonics overprinted by transpressional deformation and rapid sediment deposition since the late Pliocene. To illustrate the impact of this complex structure on strong ground motion forecasting, we simulate rupture of a proposed M 7.9 earthquake source in the Western Transverse Ranges. The results show distinct basin amplification and focusing of energy that reflects crustal structure described by the USR that is not captured by simpler velocity descriptions. We anticipate that the USR will be useful for a broad range of simulation and modeling efforts, including strong ground motion forecasting, dynamic rupture simulations, and fault system modeling. The USR is available through the Southern California Earthquake Center (SCEC) website (http://www.scec.org).", "date": "2014-04-01", "date_type": "published", "publication": "Earth and Planetary Science Letters", "volume": "415", "publisher": "Elsevier", "pagerange": "1-15", "id_number": "CaltechAUTHORS:20150409-151104225", "issn": "0012-821X", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150409-151104225", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Southern California Earthquake Center" }, { "agency": "NSF", "grant_number": "EAR-1033462" }, { "agency": "USGS", "grant_number": "G12AC20038" }, { "agency": "NSF", "grant_number": "EAR-1226343" }, { "agency": "NSF", "grant_number": "EAR-1349180" } ] }, "other_numbering_system": { "items": [ { "id": "2068", "name": "Southern California Earthquake Center" } ] }, "local_group": { "items": [ { "id": "Seismological-Laboratory" }, { "id": "Division-of-Geological-and-Planetary-Sciences" } ] }, "doi": "10.1016/j.epsl.2015.01.016", "primary_object": { "basename": "mmc1.pdf", "url": "https://authors.library.caltech.edu/records/hkka0-s0y04/files/mmc1.pdf" }, "resource_type": "article", "pub_year": "2014", "author_list": "Shaw, John H.; Plesch, Andreas; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/t0yqk-0pn58", "eprint_id": 25269, "eprint_status": "archive", "datestamp": "2023-08-22 03:27:16", "lastmod": "2023-10-24 15:45:01", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Kosarian-M", "name": { "family": "Kosarian", "given": "Minoo" } }, { "id": "Davis-P-M", "name": { "family": "Davis", "given": "Paul M." } }, { "id": "Tanimoto-Toshiro", "name": { "family": "Tanimoto", "given": "Toshiro" } }, { "id": "Clayton-R-W", "name": { "family": "Clayton", "given": "Robert W." }, "orcid": "0000-0003-3323-3508" } ] }, "title": "The relationship between upper mantle anisotropic structures beneath California, transpression, and absolute plate motions", "ispublished": "pub", "full_text_status": "public", "keywords": "California; anisotropy; motions; plate; seismic; transpression", "note": "\u00a9 2011 American Geophysical Union.\n\nReceived 3 June 2010; accepted 19 May 2011; published 20 August 2011. \n\n\n\nThis research was supported by the Southern\nCalifornia Earthquake Center. SCEC is funded by NSF cooperative\nagreement EAR-8920136 and USGS cooperative agreements 14-08-0001-A0899 and 1434-HQ-97AG01718. SCEC contribution 1482. Data\nwere obtained from the Southern and Northern California Data Centers.\nDave Okaya is thanked for anisotropy calculations used to test the stripping\nmethod. Karen Fischer is thanked for providing the propagator matrix\ncoded for anisotropic layers. Two reviewers provided comments that substantially\nimproved the paper.\n\nPublished - Kosarian2011p15715J_Geophys_Res-Sol_Ea.pdf
", "abstract": "We calculated SKS splitting parameters for the California Integrated Seismic Network. In southern California, we also estimated splitting in the upper 100 km using azimuthal anisotropy determined from surface waves. The inferred splitting from surface waves in the mantle lithosphere is small (on average < 0.2 s) compared with SKS splitting (1.5 s) and obtains a maximum value (0.5 s) in the transpressive region of the Big Bend, south of, and aligned with, the San Andreas Fault (SAF). In contrast, the SKS splitting is approximately E-W and is relatively uniform spatially either side of the Big Bend of the SAF. These differences suggest that most of the SKS splitting is generated much deeper (down to 300\u2013400 km) than previously thought, probably in the asthenosphere. Fast directions align with absolute plate motions (APM) in northern and southeastern California but not in southwestern California. We interpret the parallelism with APM as indicating the SKS anisotropy is caused by cumulative drag of the asthenosphere by the overlying plates. The discrepancy in southwestern California arises from the diffuse boundary there compared to the north, where relative plate motion has concentrated near the SAF system. In southern California the relative motion originated offshore in the Borderlands and gradually transitioned onshore to the SAF system. This has given rise to smaller displacement across the SAF (160\u2013180 km) compared with central and northern California (400\u2013500 km). Thus, in southwestern California the inherited anisotropy, from prior North American APM, has not yet been overprinted by Pacific APM.", "date": "2011-08-20", "date_type": "published", "publication": "Journal of Geophysical Research B", "volume": "116", "publisher": "American Geophysical Union", "pagerange": "Art. No. B08307", "id_number": "CaltechAUTHORS:20110909-102813331", "issn": "0148-0227", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110909-102813331", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Southern California Earthquake Center (SCEC)" }, { "agency": "NSF", "grant_number": "EAR-8920136" }, { "agency": "USGS", "grant_number": "14-08-0001-A0899" }, { "agency": "USGS", "grant_number": "1434-HQ-97AG01718" } ] }, "other_numbering_system": { "items": [ { "id": "1482", "name": "Southern California Earthquake Center (SCEC)" } ] }, "local_group": { "items": [ { "id": "Seismological-Laboratory" }, { "id": "Division-of-Geological-and-Planetary-Sciences" } ] }, "doi": "10.1029/2010JB007742", "primary_object": { "basename": "Kosarian2011p15715J_Geophys_Res-Sol_Ea.pdf", "url": "https://authors.library.caltech.edu/records/t0yqk-0pn58/files/Kosarian2011p15715J_Geophys_Res-Sol_Ea.pdf" }, "resource_type": "article", "pub_year": "2011", "author_list": "Kosarian, Minoo; Davis, Paul M.; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/mj23k-y5p83", "eprint_id": 33464, "eprint_status": "archive", "datestamp": "2023-08-22 09:57:36", "lastmod": "2023-10-18 19:56:36", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Zhang-Yu-Shen", "name": { "family": "Zhang", "given": "Yu-Shen" } }, { "id": "Tanimoto-Toshiro", "name": { "family": "Tanimoto", "given": "Toshiro" } }, { "id": "Stolper-E-M", "name": { "family": "Stolper", "given": "Edward M." }, "orcid": "0000-0001-8008-8804" } ] }, "title": "S-Wave velocity, basalt chemistry and bathymetry along the Mid-Atlantic Ridge", "ispublished": "pub", "full_text_status": "restricted", "note": "\u00a9 1994 Elsevier Science B.V. \n\nReceived 1 January 1993. Accepted 8 December 1993. \n\nWe thank Thorne Lay for stimulating discussions and suggestions. We thank Charles J. Ammon, Thorne Lay, Jeal-Paul Montagner, and two anonymous reviewers for thorough, constructive reviews which helped clarify our presentation. This work was partially supported by grant LANL/UCRP 354 from the Institute of Geophysics and Planetary Physics, Los Alamos National Laboratory, and NSF grands EAR-8451715, and EAR-9219607, with facilities support from the W.M. Keck Foundation. This paper is Contribution 199, Institute of Tectonics, University of California, Santa Cruz.", "abstract": "Major element chemistry of mid-ocean ridge basalt, S-wave velocity and bathymetry along the Mid-Atlantic Ridge are correlated on an intermediate length scale, and the large anomalies in these observations are associated with hotspot locations. The best correlations are for at depths of 100\u2013200 km, and there is no correlation for depths of 300 km or deeper. S-Wave velocities are low directly under the Mid-Atlantic Ridge above 100 km, but the low-velocity regions shift away from the ridge at greater depth, and a sinuous strip of asthenospheric low velocity extends along the Atlantic hotspots from the Azores to Tristan da Cunha. These features suggest that common physical processes in the upper mantle produce these anomalies. An inspection of the history of the Atlantic Ocean suggests that the asthenospheric low-velocity strip may record earlier ridge position or possible upwelling in the mantle. Possible interaction between hotspots and the ridge blurs the distinction between passive and active upwellings.", "date": "1994-07", "date_type": "published", "publication": "Physics of the Earth and Planetary Interiors", "volume": "84", "number": "1-4", "publisher": "Elsevier", "pagerange": "79-93", "id_number": "CaltechAUTHORS:20120822-154902633", "issn": "0031-9201", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120822-154902633", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Los Alamos National Laboratory", "grant_number": "LANL/UCRP 354" }, { "agency": "NSF", "grant_number": "EAR-8451715" }, { "agency": "NSF", "grant_number": "EAR-9219607" } ] }, "other_numbering_system": { "items": [ { "id": "199", "name": "University of California, Santa Cruz, Institute of Tectonics" } ] }, "local_group": { "items": [ { "id": "Division-of-Geological-and-Planetary-Sciences" } ] }, "doi": "10.1016/0031-9201(94)90035-3", "resource_type": "article", "pub_year": "1994", "author_list": "Zhang, Yu-Shen; Tanimoto, Toshiro; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/1qra6-ejp94", "eprint_id": 44278, "eprint_status": "archive", "datestamp": "2023-08-22 09:49:23", "lastmod": "2023-10-26 00:21:22", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Tanimoto-Toshiro", "name": { "family": "Tanimoto", "given": "Toshiro" } }, { "id": "Stevenson-D-J", "name": { "family": "Stevenson", "given": "David J." }, "orcid": "0000-0001-9432-7159" } ] }, "title": "Seismic constraints on a model of partial melts under ridge axes", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 1994 American Geophysical Union. Received March 17, 1993; revised November 22, 1993; accepted November 30, 1993.\n\nThis work was supported by NSF grants OCE-9296207 and EAR-9296218 (TT) and EAR-9017893 (DJS). Institute of Crustal Studies Contribution number 143-24CS at UCSB Division of Geological and Planetary Sciences contribution number 5349 at Caltech. The paper benefited greatly by the constructive reviews provided by Anne Sheehan, Charles Langmuir, an anonymous reviewer, and an associate editor.\nPaper number 93JB03402.\n\nPublished - jgrb9438.pdf
", "abstract": "In a recent global scale seismic study, the correlation between S wave velocity under ridge axes and spreading rate was pointed out. The correlation is strong for depths to about 70 km, but it diminishes below this depth. We present the correlation plots at four depths, 38, 66, 90, and 110 km, for which correlation is strong at 38 and 66 km but is weak at 90 km and is almost nonexistent at 110 km. We present a model to explain this behavior, which includes a thermal conduction model for the development of lithosphere and a simple melt percolation. Thermal effects on S wave velocity are assumed to be accounted for entirely by the plate cooling (thermal conduction) model. We point out that the thermal model under this assumption predicts asymptotically no correlation between S wave velocity and spreading rate, specifically for spreading rate larger than about 3 cm yr^(\u22121). This contradicts the correlation observed in the data at shallow depths. The existence of partial melt is thus required to explain the observed behavior at 38 and 66 km depths. We start from four basic equations that govern the distribution of partial melt and derive the relation between the amount of partial melt and the spreading rate. We adopt a simple power law relation between permeability (k) and porosity (\u0192) by k(\u0192) = k_0\u0192^n, where k_0 and n are constants and assume that pores are filled with melt. We then set up an integral relation between S wave velocity and spreading rate. The final formula indicates that the gradient in the correlation plots is the inverse of the power (1/n) in the permeability-porosity relation, thus enabling us to constrain n as well as k_0 from seismic data. The data also have some sensitivity to the depth to solidus. We show that (1) the depth to solidus is probably within the range 60\u2013100 km and (2) if the power n is n = 2\u20133, then k_0 = 10^(\u22128) - 10^(\u221210) m^2. These parameters predict that porosity and fluid velocity are 1\u20132% and about 0.5 m yr^(\u22121), respectively. The depth to solidus is consistent with previous estimates by petrological data but is perhaps the first and direct seismological evidence of partial melt from surface wave data. Analytical forms for the dependence on depth and spreading rate of porosity, fluid velocity within permeable rocks, and ascent times of magma are also obtained.", "date": "1994-03-10", "date_type": "published", "publication": "Journal of Geophysical Research B", "volume": "99", "number": "B3", "publisher": "American Geophysical Union", "pagerange": "4549-4558", "id_number": "CaltechAUTHORS:20140312-112218874", "issn": "0148-0227", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140312-112218874", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF", "grant_number": "OCE-9296207" }, { "agency": "NSF", "grant_number": "EAR-9296218" }, { "agency": "NSF", "grant_number": "EAR-9017893" } ] }, "other_numbering_system": { "items": [ { "id": "5349", "name": "Caltech Division of Geological and Planetary Sciences" } ] }, "local_group": { "items": [ { "id": "Division-of-Geological-and-Planetary-Sciences" } ] }, "doi": "10.1029/93JB03402", "primary_object": { "basename": "jgrb9438.pdf", "url": "https://authors.library.caltech.edu/records/1qra6-ejp94/files/jgrb9438.pdf" }, "resource_type": "article", "pub_year": "1994", "author_list": "Tanimoto, Toshiro and Stevenson, David J." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/jbpzt-eqk25", "eprint_id": 66594, "eprint_status": "archive", "datestamp": "2023-08-20 01:35:01", "lastmod": "2023-10-18 18:36:53", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Kohler-M-D", "name": { "family": "Kohler", "given": "Monica D." } }, { "id": "Tanimoto-Toshiro", "name": { "family": "Tanimoto", "given": "Toshiro" } } ] }, "title": "One-layer global inversion for outermost core velocity", "ispublished": "pub", "full_text_status": "restricted", "note": "\u00a9 1992 Elsevier.\n\nReceived 6 February 1992; accepted 10 February 1992.\n\nThis research was supported by National Science Foundation grant EAR9103526. M. D. Kohler was supported by C. B. Luce and ARCS graduate fellowships. This paper is Contribution 5118, Division of Geological and Planetary Sciences of the California Institute of Technology.", "abstract": "The most direct method for constraining physical properties of the outermost core involves analysis of SnKS waveforms (where n is an integer). However, the physical nature of this region remains ambiguous in spite of its significance in geodynamic, geomagnetic, and seismic models of the Earth's deep interior. Global inversion for P-wave velocity in the outermost 200 km of the core from SKS and SKKS waveforms is examined here. The inversion process consists of constructing synthetic seismograms using normal mode theory, and solving for first-order perturbations to P-wave velocity. Spheroidal modes with periods between 33 and 100 s are chosen to model the waveforms and P-wave velocity perturbation is solved along individual raypaths, assuming a laterally homogeneous initial model. The dataset includes about 800 digital, long-period radial seismograms from earthquakes which have occurred globally. Seismograms were chosen for source-receiver distances of 110\u2013130\u00b0 in which SKS and SKKS are best isolated in time from nearby phases. We have attempted to remove the effects of mantle heterogeneity by incorporating the mantle velocity model MDLSH. Figures of P-wave velocity results, plotted at the midpoint between source and receiver, show large-scale patterns of positive and negative lateral velocity variation. There are also regions of inconsistencies, not simply explained by core-mantle boundary (CMB) topography or crisscrossing raypaths. There is no clear dependence of residuals on latitude. Incorporation of a modified version of MDLSH does not significantly change our solutions, suggesting that the resolution length scales of global mantle models are too large to remove important smaller-wavelength (less than 1000 km) mantle heterogeneity effects. Furthermore, raypaths of SKS and SKKS independently go through laterally different structure relative to normal mode wavelengths, starting well above the CMB. These results suggest that simultaneous waveform inversion for P- and S-wave velocities is a more reliable way of constructing a model of outermost core structure.", "date": "1992-08", "date_type": "published", "publication": "Physics of the Earth and Planetary Interiors", "volume": "72", "number": "3-4", "publisher": "Elsevier", "pagerange": "173-184", "id_number": "CaltechAUTHORS:20160502-141644896", "issn": "0031-9201", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160502-141644896", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF", "grant_number": "EAR9103526" }, { "agency": "C. B. Luce" }, { "agency": "ARCS Felllowhsip" } ] }, "doi": "10.1016/0031-9201(92)90200-F", "resource_type": "article", "pub_year": "1992", "author_list": "Kohler, Monica D. and Tanimoto, Toshiro" }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/jy80n-m1t49", "eprint_id": 56608, "eprint_status": "archive", "datestamp": "2023-08-20 01:00:31", "lastmod": "2023-10-23 15:36:59", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Zhang-Yu-Shen", "name": { "family": "Zhang", "given": "Yu-Shen" } }, { "id": "Tanimoto-Toshiro", "name": { "family": "Tanimoto", "given": "Toshiro" } } ] }, "title": "Ridges, hotspots and their interaction as observed in seismic velocity maps", "ispublished": "pub", "full_text_status": "restricted", "note": "\u00a9 1992 Nature Publishing Group.\n\nWe thank D. L. Anderson. D. Dreger, B. L. N. Kennett, R. Jeanloz, M. Kohler, T. Lay and N. Sleep for comments. This research was supported by the NSF.", "abstract": "A new global S-wave velocity model reveals that although mid-ocean ridges and hotspots are both underlain by low-velocity anomalies in the mantle, these have distinctly different structures. This implies that there are differences between the upwelling mechanisms under ridges and under hot-spots. The velocity model also shows that there may be interactions between ridges and hotspots near Afar and St Helena.", "date": "1992-01-02", "date_type": "published", "publication": "Nature", "volume": "355", "number": "6355", "publisher": "Nature Publishing Group", "pagerange": "45-49", "id_number": "CaltechAUTHORS:20150413-134654802", "issn": "0028-0836", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150413-134654802", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF" } ] }, "doi": "10.1038/355045a0", "resource_type": "article", "pub_year": "1992", "author_list": "Zhang, Yu-Shen and Tanimoto, Toshiro" }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/24n8s-z3349", "eprint_id": 65245, "eprint_status": "archive", "datestamp": "2023-08-19 23:53:13", "lastmod": "2023-10-18 14:27:16", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Tanimoto-Toshiro", "name": { "family": "Tanimoto", "given": "Toshiro" } }, { "id": "Inoue-Hiroshi", "name": { "family": "Inoue", "given": "Hiroshi" } } ] }, "title": "Long wavelength characteristics of Earth structure", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 1991 California Institute of Technology.\n\nPublished - Tanimoto_1991.pdf
", "abstract": "Considerable efforts have been paid to analyse digital seismic network data and ISC\n(International Seismological Center) data during the last decade. Although there are still\nuncertainties in seismic maps, some consistent results for long wavelength characteristics\nof Earth's heterogeneity have emerged. We briefly summarize those features in this\npaper.", "date": "1991-04", "date_type": "published", "publisher": "California Institute of Technology", "id_number": "CaltechAUTHORS:20160309-110456619", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160309-110456619", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "primary_object": { "basename": "Tanimoto_1991.pdf", "url": "https://authors.library.caltech.edu/records/24n8s-z3349/files/Tanimoto_1991.pdf" }, "resource_type": "book_section", "pub_year": "1991", "author_list": "Tanimoto, Toshiro and Inoue, Hiroshi" }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/wapz3-wa286", "eprint_id": 65249, "eprint_status": "archive", "datestamp": "2023-08-19 23:53:22", "lastmod": "2023-10-18 14:27:28", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Zhang-Yu-Shen", "name": { "family": "Zhang", "given": "Yu-Shen" } }, { "id": "Tanimoto-Toshiro", "name": { "family": "Tanimoto", "given": "Toshiro" } } ] }, "title": "Oceanic Lithosphere: perspectives from Love wave phase velocity", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 1991 California Institute of Technology.\n\nPublished - Zhang_1991.pdf
", "abstract": "Global Love wave phase velocity variations are constructed for periods between 80 and 200 seconds by using approximately 9,000 paths from 971 events (with M \u2265 5.5). The block parameterization approach (5\u00b0 X 5\u00b0 near equator) is used in this study. With improved resolution of about 1000 km, we attempt to study the oceanic lithosphere structure by using these results, because they are very sensitive to structure variation in the upper 200 km near the surface.", "date": "1991-04", "date_type": "published", "publisher": "California Institute of Technology", "id_number": "CaltechAUTHORS:20160309-151415130", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160309-151415130", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "primary_object": { "basename": "Zhang_1991.pdf", "url": "https://authors.library.caltech.edu/records/wapz3-wa286/files/Zhang_1991.pdf" }, "resource_type": "book_section", "pub_year": "1991", "author_list": "Zhang, Yu-Shen and Tanimoto, Toshiro" }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/47sg1-fs734", "eprint_id": 65248, "eprint_status": "archive", "datestamp": "2023-08-19 23:53:17", "lastmod": "2023-10-18 14:27:25", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Zhang-Yu-Shen", "name": { "family": "Zhang", "given": "Yu-Shen" } }, { "id": "Tanimoto-Toshiro", "name": { "family": "Tanimoto", "given": "Toshiro" } } ] }, "title": "Ridges and hotspots: perspectives from global tomography", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 1991 California Institute of Technology.\n\nPublished - Zhang_1991.pdf
", "abstract": "Resolution in global tomography has improved to a level of about 1000 km\ndue to a rapid increase of digital data during the last decade. We have started to\nsee various important tectonic features in some detail. We will attempt to summarize\nour current observations for ridges and hotspots.", "date": "1991-04", "date_type": "published", "publisher": "California Institute of Technology", "id_number": "CaltechAUTHORS:20160309-150809099", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160309-150809099", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "primary_object": { "basename": "Zhang_1991.pdf", "url": "https://authors.library.caltech.edu/records/47sg1-fs734/files/Zhang_1991.pdf" }, "resource_type": "book_section", "pub_year": "1991", "author_list": "Zhang, Yu-Shen and Tanimoto, Toshiro" } ]