科研之友
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摘要
We studied the distribution of asperities for large recent earthquakes along the New Britain trench, Papua New Guinea, to investigate if they are the same for repeated ruptures of the subduction boundary. We determined the slip distributions of two earthquakes (M(w) similar to 8) in 1971 using P(dif)f waveforms, and an earthquake (M(w) 7.9) in 1995 using direct teleseismic P waves. Combining these findings with previous results for two earthquakes (M(w) similar to 7.5) in 2000, we compared the source areas and asperity distributions for this region of the New Britain Trench. Our results show that the locations of the asperities for the individual earthquakes did not significantly overlap, although the same portion of the subduction zone seems to have reruptured. This fact supports the idea that asperities are not persistent features when portions of the New Britain subduction zone slip in large earthquakes.
- 出版日期2007-3-8
- 单位防灾科技学院
