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Rate change observed at JPLM after the Northridge earthquake

机译:北岭地震后在JPLM上观察到的速率变化

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Geodetic time series determined with the Global Positioning System indicate that the geodetic rate of a permanent site in Pasadena, California (JPLM) changed significantly after the 17 January 1994 Northridge California earthquake. Subtracting the pre-quake rate and co-seismic offset leaves 30 +/- 4 mm of integrated eastward excess motion observed in the three years following the earthquake. North and vertical components show excess motion of -11 +/- 3 mm and 25 +/- 11 mm respectively. Local surveys to three additional points near JPLM changed by no more than 6 mm E, 3 mm N, and 15 mm V during the two years after the earthquake, ruling out the possibility of a local effect at the JPLM monument. The direction and size of the post-seismic displacements at JPLM are not consistent with additional slip on the fault which ruptured. The most rapid accumulation of excess motion occurs immediately after the earthquake, suggesting a relationship between the two events. [References: 22]
机译:用全球定位系统确定的大地时间序列表明,在1994年1月17日加利福尼亚北岭地震之后,加利福尼亚州帕萨迪纳(JPLM)永久性站点的大地测量速度发生了显着变化。减去震前发生率和同震偏移,可在地震后的三年中观察到30 +/- 4 mm的整体东移运动。北部和垂直部分的多余运动分别为-11 +/- 3毫米和25 +/- 11毫米。在地震发生后的两年内,对JPLM附近的三个附加点进行的当地调查变化不超过6毫米E,3毫米N和15毫米V,排除了在JPLM纪念碑上产生局部影响的可能性。 JPLM地震后位移的方向和大小与断裂上的额外滑动不符。多余的运动最迅速的累积是在地震发生后立即发生,表明这两个事件之间存在关联。 [参考:22]

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