[
    {
        "id": "thesis:6319",
        "collection": "thesis",
        "collection_id": "6319",
        "cite_using_url": "https://resolver.caltech.edu/CaltechTHESIS:04132011-081816354",
        "primary_object_url": {
            "basename": "Smith_sw_1961.pdf",
            "content": "final",
            "filesize": 13512445,
            "license": "other",
            "mime_type": "application/pdf",
            "url": "/6319/1/Smith_sw_1961.pdf",
            "version": "v4.0.0"
        },
        "type": "thesis",
        "title": "An Investigation of the Earth's Free OsciIIations",
        "author": [
            {
                "family_name": "Smith",
                "given_name": "Stewart Wilson",
                "clpid": "Smith-Stewart-Wilson"
            }
        ],
        "thesis_advisor": [
            {
                "family_name": "Press",
                "given_name": "Frank",
                "clpid": "Press-F"
            },
            {
                "family_name": "Benioff",
                "given_name": "Hugo",
                "clpid": "Benioff-H"
            }
        ],
        "thesis_committee": [
            {
                "family_name": "Unknown",
                "given_name": "Unknown"
            }
        ],
        "local_group": [
            {
                "literal": "div_gps"
            }
        ],
        "abstract": "The free oscillations of the earth excited by the Chilean earthquake of 1960 have been measured by power spectral analysis of strain and pendulum seismographs. A revised and more precise table of free oscillation periods is presented. The period of the fundamental spheroidal mod _0S^0_2 is 53.82 minutes.\r\n\r\nFine structure analysis has shown that for the first three spheroidal modes there is good agreement between the observed splitting and that calculated for a rotating earth. Results for the toroidal modes are uncertain.\r\n\r\nA theory is presented that allows recovery of some of the source properties from observations of phase differences for spheroidal modes. A comparison of theory with observation confirms original estimates of a fault length of 1000 km and a rupture velocity of between 3 and 4 km/sec. The effect of a moving source that decays exponentially with distance changes the pattern of phase shifts slightly but does not change estimates of the fault parameters. An alternative interpretation of the source properties in terms of the relative amplitudes of 2n + 1 split lines for each mode is presented but no calculations are performed.\r\n\r\nPreliminary data on the effects of geomagnetic storms on the oscillations of the earth place an upper limit of about 5 x 10^(16) ergs/cph for the energy density associated with the elastic coupling of several magnetic storms.\r\n",
        "doi": "10.7907/S9RW-R653",
        "publication_date": "1961",
        "thesis_type": "phd",
        "thesis_year": "1961"
    },
    {
        "id": "thesis:63",
        "collection": "thesis",
        "collection_id": "63",
        "cite_using_url": "https://resolver.caltech.edu/CaltechETD:etd-01082004-111506",
        "primary_object_url": {
            "basename": "Lomnitz_c_1955.pdf",
            "content": "final",
            "filesize": 9503362,
            "license": "other",
            "mime_type": "application/pdf",
            "url": "/63/1/Lomnitz_c_1955.pdf",
            "version": "v2.0.0"
        },
        "type": "thesis",
        "title": "Creep Measurements in Igneous Rocks with Some Applications to Aftershock Theory",
        "author": [
            {
                "family_name": "Lomnitz",
                "given_name": "Cinna",
                "clpid": "Lomnitz-Cinna"
            }
        ],
        "thesis_advisor": [
            {
                "family_name": "Benioff",
                "given_name": "Hugo",
                "clpid": "Benioff-H"
            }
        ],
        "thesis_committee": [
            {
                "family_name": "Unknown",
                "given_name": "Unknown"
            }
        ],
        "local_group": [
            {
                "literal": "div_gps"
            }
        ],
        "abstract": "<p>First Part.</p> \r\n\r\n<p>Cylindrical specimens of Southern California granodiorite and gabbro were creep-tested at constant torques in a high-magnification torsion apparatus. Complete creep and creep recovery curves at room temperature were recorded for periods of about 10,000 minutes.</p>\r\n\r\n<p>The results are represented by an empirical equation of the form: s = p (a+b log t) where s is the strain, p the stress and t the time. No evidence was found of creep behavior suggestive of the Michelson equation.</p>\r\n\r\n<p>For some granodiorite samples the viscosity was of the order of 3 x 10\u00b9\u2075 poises. The behavior of the rocks under prevailing test conditions was not appreciably different from that of other polycrystalline materials.</p>\r\n\r\n<p>Second Part.</p>\r\n\r\n<p>A quantitative treatment of the Benioff aftershock sequences on the basis of the theory of viscoelasticity is given. The minimum coefficient of viscosity found by this method is of the order of 10[superscript 19] poises, in good agreement with accepted viscosity values for the earth's crust.</p>",
        "doi": "10.7907/A2KE-9Y60",
        "publication_date": "1955",
        "thesis_type": "phd",
        "thesis_year": "1955"
    }
]