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Spatiotemporal Distribution of Microearthquakes and Implications Around the Seismic Gap Between the Wenchuan and Lushan Earthquakes

机译：汶川地震与庐山地震微间隙的时空分布及其在地震间隙附近的意义

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摘要

The mechanism of why the rupture terminated sharply on both sides of the seismic gap between the Wenchuan and Lushan earthquakes is not yet known along the southwestern Longmen Shan fault zone. The accommodation modes of compressional strain and stress are still not known well in the gap subregion. Using the Match and Locate method, we obtained a detailed catalog of background microearthquakes around the seismic gap from May to December 2015. The characteristics of spatiotemporal distribution of the events is highlighted with a complete magnitude of 0.2. These small events tend to concentrate at different depth ranges on two sides of the seismic gap, indicating that the gap serves as a transition zone between the Wenchuan and Lushan source regions. Strain release through microearthquakes is an unlikely candidate for accommodating modes in the gap, because of the sustained deficit of microseismicity. A strong anticorrelation between background seismicity and monthly precipitation variation rate is observed for different magnitude scales. Enhanced seismicity may be activated by the terrestrial water storage reduction next to a precipitation peak with a time lag of 1-2months during the summer and autumn, indicating a seasonal modulation of seismicity by the water storage cycle. The background microseismicity exhibits prominent responses to precipitation variation due to a short nucleation duration of less than one quarter.
机译：在西南龙门山断裂带上，为何破裂在汶川地震和庐山地震之间的地震间隙的两侧急剧终止的机理尚不清楚。在缝隙子区域中，压缩应变和应力的调节方式仍然不太清楚。使用“匹配并定位”方法，我们获得了2015年5月至2015年12月地震间隙周围背景微地震的详细目录。事件的时空分布特征以0.2的完整幅度突出显示。这些小事件倾向于集中在地震缝隙两侧的不同深度范围，表明该缝隙是汶川地震源与庐山地震源区之间的过渡带。由于微震的持续缺乏，通过微地震释放的应变不太可能成为适应缝隙模式的候选者。对于不同的震级，背景地震活动度与月降水变化率之间存在很强的反相关性。在夏季和秋季，通过在1-2个月的时间滞后下一个降水高峰旁边的陆地储水量减少，可以激活增强的地震活动性，这表明储水周期对地震活动性的季节性调节。由于成核时间短于四分之一，本底微震对降水变化表现出突出的响应。

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