SOURCE PARAMETERS OF THE 1980 MAMMOTH LAKES, CALIFORNIA, EARTHQUAKE SEQUENCE
SOURCE PARAMETERS OF THE 1980 MAMMOTH LAKES, CALIFORNIA, EARTHQUAKE SEQUENCE
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DOI：
10.1029/jb087ib06p04595
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发表时间：
1982-01-01
影响因子：
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通讯作者：
SPUDICH, P
中科院分区：
文献类型：
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作者：
ARCHULETA, RJ;CRANSWICK, E;SPUDICH, P
三分量数字地震仪（Spudich 等人，1981）记录了 1500 多起猛犸湖地震，其中 150 起用于分析位置、机制和震源参数。 9次地震3.9≤M≤5.1的复合断层面解定义了在S75°E的陡倾近东西平面上的右旋走滑机制或在N10°E的近南北平面上的左旋走滑机制。余震位置良好的垂直剖面表明可能有三个东西向平面与ML≥6.0的四次最大地震的位置重合。利用 Swaves 的频谱分析（Brune，1970），确定了 67 次地震的震源参数。 48 颗星等大于或等于 3.0。地震矩范围为9.20×1018dyn cm至2.33×1024dyn cm。地震矩大于约 1.0×1021dyn cm 的地震具有几乎恒定的应力降（≃ 50 巴）；地震矩小于约1.0×1021dyn cm的地震，其应力降随着地震矩的减小而明显减小。
From the more than 1500 Mammoth Lakes earthquakes recorded on three‐component digital seismographs (Spudich et al., 1981), 150 were used in an analysis of the locations, mechanism, and source parameters. A composite fault plane solution of nine earthquakes 3.9 ≤M≤ 5.1 defines a right‐lateral strike slip mechanism on a steeply dipping nearly east‐west plane striking S75°E or left‐lateral strike slip on a nearly north‐south plane striking N10°E. Vertical cross sections of well‐located aftershocks indicate possibly three east‐west planes that coincide with the locations of the four largest earthquakes withML≥ 6.0. Using the spectral analysis ofSwaves (Brune, 1970), source parameters for 67 earthquakes were determined. Forty‐eight had magnitudes greater than or equal to 3.0. Seismic moments ranged from 9.20×1018dyn cm to 2.33×1024dyn cm. Earthquakes with seismic moment greater than about 1.0×1021dyn cm had nearly constant stress drops (≃ 50 bars); earthquakes with seismic moment less than about 1.0×1021dyn cm had stress drops that apparently decrease as seismic moment decreases.