Seismic moment, stress, and source dimensions for earthquakes in the California-Nevada region
作者： Max Wyss , James N. Brune
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摘要: The source mechanism of earthquakes in the California-Nevada region was studied using surface wave analyses, displacement observations region, magnitude determinations, and accurate epicenter locations. Fourier analyses waves from thirteen Parkfield have yielded following relationship between seismic moment, M0 Richter magnitude, ML: log = 1.4 ML + 17.0, where 3 < 6. relation envelope parameter AR moment obtained: AR300 20.1. This used to estimate 259 additional western United States. combined data yield local magnitude: 1.7 15.1, These together with Gutenberg-Richter energy-magnitude formula suggest that average stress multiplied by efficiency is about 7 bars for small at Imperial Valley, 30 near Wheeler Ridge on White Wolf fault, over 100 Arizona-Nevada Laguna Salada (Baja California) regions. Field associated eight shocks, along estimates fault area, indicate dimensions similar values found earlier earthquake are rule rather than exception San Andreas fault. Stress drops appear be 10% efficiency. revised curve versus further emphasizes not important strain release zone shear may 6 km vertical extent Valley even less oceanic transform faults.
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