2009年8月9日日本伊豆群岛地震矩张量解

Quick moment tensor solution of the August 9, 2009 Izu Islands, Japan earthquake

2009年8月9日10点55分56秒协调世界时(UTC),在日本本州以南的伊豆群岛地区发生了MW7.2地震,震源深度303km.作者利用矩张量快速反演技术,通过反演全球台网的宽频带P波波形得到了这次地震的矩张量解,并判断走向188°、倾角90°、滑动角79°的节面是地震发生的断层面.

An MW7.2 earthquake occurred in Izu Islands, off the south coast of Honshu, Japan at 10：55：56 UTC, August 9, 2009. Its focal depth is 303 km. We obtained the moment tensor solution of the earthquake by inverting the P waveforms of broadband recordings from the GSN stations using the quick technique of moment tensor inversion, and further inferred that the nodal plane of strike 188°, dip 90°, rake 79° be the seismogenic fault.