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Radiated Energy of Great Earthquakes from Teleseismic Empirical Green’s Function Deconvolution 总被引：1，自引：0，他引：1
Annemarie S. Baltay Gregory C. Beroza Satoshi Ide 《Pure and Applied Geophysics》2014,171(10):2841-2862
We expand on the empirical Green’s function deconvolution method of Ide et al. (2011) to estimate radiated energy for the six largest earthquakes worldwide over the last 10 years: 2011 M w 9.0 Tohoku-Oki, 2004 M w 9.1 Sumatra, 2010 M w 8.8 Maule, 2005 M w 8.7 Nias, 2007 M w 8.5 Bengkulu, and 2012 M w 8.6 off-Sumatra. Deconvolution of P, SV and SH components gives consistent energy results that are comparable to estimates found independently by other researchers. Apparent stress for the five great thrust earthquakes is between 0.4 and 0.8 MPa, while the 2012 off-Sumatra strike-slip earthquake has a higher apparent stress of 3 MPa, which is consistent with other studies that find a tendency for strike-slip events to be more energetic. Our results are within the spread of apparent stress from the wider global earthquake population over a large magnitude range. The azimuthal distribution of energy in each case shows signs of directivity, and in some cases, shows less energy radiated in the trench-ward direction, which may suggest enhanced tsunami potential. We find that eGfs as small as ~M 6.5 can be used for teleseismic deconvolution, and that an eGf-mainshock magnitude difference of 1.5 units yields stable results. This implies that M 8 is the minimum mainshock size for which teleseismic eGf deconvolution will work well. We propose that a database of eGf events could be used to calculate radiated energy and apparent stress of great, hazardous events in near real time, i.e., promptly enough that it could contribute to rapid response measures. 相似文献
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最近观测到的异常地震事件——深部低频地震和颤动、甚低频地震及慢滑动事件——形成了慢震群,而这个慢震群受控于不同于普通地震的标定律。根据这个标定律,我们在日本西部的纪伊半岛下方观测到了之前未知的事件,其震源持续时间约20-200s,矩震级为3～4级。这些地震在2～8Hz的频带范围内辐射能量,直接与其地震矩率成比例,但这个比例常数比一般地震小4～5个数量级。这个地区的慢地震可能是由大量的剪切滑动事件组成的,从地震方法上看,总体上会呈现为颤动或长达200s持续时间的较长独立事件,从大地测量方法上看,是慢滑动事件。 相似文献
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Germán A. Prieto Marine Denolle Jesse F. Lawrence Gregory C. Beroza 《Comptes Rendus Geoscience》2011,343(8-9):600-614
The use of the ambient seismic field (ASF) to extract Earth's response has received significant attention in the last several years. Multiple studies demonstrate the utility of the ASF for estimating high-resolution velocity models in various locations. In this paper, we discuss the amplitude information carried by the ASF. Amplitude information includes both amplification effects due to elastic structure, such as low velocity sedimentary basins, and attenuation effects in the crust and upper mantle or even in buildings. As has been suggested by other authors, amplitude measurements may be biased due to non-uniformities in ambient field excitation; however, we find very similar and stable results for different time intervals for both amplification and attenuation, suggesting that this bias may not be as large as feared. We conclude that valuable amplitude information can be recovered from the ASF through careful processing. Amplitude measurements may be particularly valuable due to the enhanced sensitivity of attenuation to fluids and/or temperature fluctuations. 相似文献
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1995年1月17日凌晨发生在大阪湾西侧的M6．9级兵库县南部地震已经过去了15年。此次地震从淡路岛东北端附近开始,同时向西北和东南破裂。在东南方向,右旋断裂从震中延伸约20km到达地球表面。在西北方向,破裂延伸约25km直达神户市下方。断裂没有到达神户地表,但破裂的方向和速度对波场产生了强大的前向方向性效应, 相似文献
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