Space geodetic observation of expansion of the San Gabriel Valley, California, aquifer system, during heavy rainfall in winter 2004–2005
Space geodetic observation of expansion of the San Gabriel Valley, California, aquifer system, during heavy rainfall in winter 2004–2005
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DOI：
10.1029/2006jb004448
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发表时间：
2007-03
影响因子：
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通讯作者：
N. King;D. Argus;J. Langbein;D. Agnew;G. Bawden;R. Dollar;Zhen Liu;Zhen Liu;D. Galloway
中科院分区：
文献类型：
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作者：
N. King;D. Argus;J. Langbein;D. Agnew;G. Bawden;R. Dollar;Zhen Liu;Zhen Liu;D. Galloway
[1]从2005年初开始，南加州圣加布里埃尔山谷地区的GPS站的位置在统计上明显偏离了它们以前的行为。Long站向上移动了约47毫米，附近的站距离Long站移动了约10毫米。这些变化始于加利福尼亚州南部一个极端多雨的季节，与鲍德温公园附近一口井的水位上升16米和干涉合成孔径雷达探测到的地区性隆起相吻合。在南加州其他地方的GPS站点位置时间序列中没有看到类似的信号。我们更喜欢的解释是，在2004-2005年接近纪录的降雨量之后，含水层重新补给，这一解释得到了时间和水文模拟的支持。我们不能排除无震滑动事件的可能性，但我们认为这种事件不太可能发生，因为它需要在多个断层上滑动，并预测了其他未被观测到的信号。
[1] Starting early in 2005, the positions of GPS stations in the San Gabriel valley region of southern California showed statistically significant departures from their previous behavior. Station LONG moved up by about 47 mm, and nearby stations moved away from LONG by about 10 mm. These changes began during an extremely rainy season in southern California and coincided with a 16-m increase in water level at a nearby well in Baldwin Park and a regional uplift detected by interferometric synthetic aperture radar. No equivalent signals were seen in GPS station position time series elsewhere in southern California. Our preferred explanation, supported by the timing and by a hydrologic simulation, is deformation due to recharging of aquifers after near-record rainfall in 2004–2005. We cannot rule out an aseismic slip event, but we consider such an event unlikely because it requires slip on multiple faults and predicts other signals that are not observed.