Microearthquakes and subglacial conditions
Microearthquakes and subglacial conditions
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微地震和冰下条件
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
A. Smith
中科院分区：
文献类型：
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作者：
A. Smith
10个被动地震记录站部署在南极洲西部Rutford冰流的9公里× 6公里阵列中，以探测冰流床的微震。该阵列所覆盖的地区，从地震反射勘测中确定了基底沉积条件的不同分布，并将其解释为基底滑动和冰下沉积变形的地区。被动地震实验的目的是独立确认这一解释，因为据信，基底滑动与释放的声能比变形床多。结果表明，这是情况下，基底滑动产生的事件的6倍。这证实了基础条件的空间格局确实反映了不同冰流机制的分布。它还表明，微地震监测可以是一个有价值的新技术映射冰流的基础条件在广泛的地区。
Ten passive seismic recording stations were deployed in a 9 km by 6 km array on Rutford Ice Stream, West Antarctica, to detect microearthquakes from the ice stream bed. The array covered an area where a varying distribution of basal sedimentary conditions had been identified from seismic reflection surveys and interpreted as areas of both basal sliding and subglacial sediment deformation. The passive seismic experiment was designed to give an independent confirmation of this interpretation, as basal sliding is believed to be associated with the release of more acoustic energy than a deforming bed. The results show that this is the case, basal sliding producing six times more events. This confirms that the spatial pattern of basal conditions does indeed reflect the distribution of different ice flow mechanisms. It also shows that microearthquake monitoring can be a valuable new technique for mapping ice stream basal conditions over wide areas.