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arXiv 1609.03243physics.geo-ph
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2016年熊本地震前的地震活动

Seismicity prior to the 2016 Kumamoto earthquakes

K. Z. Nanjo, J. Izutsu, Y. Orihara, N. Furuse, S. Togo, H. Nitta, T. Okada, R. Tanaka, M. Kamogawa, T. Nagao

摘要:

我们报告了2016年熊本地震前的地震模式,这些地震模式是通过四种不同的方法测量的,这些方法基于可用于地震预报的地震活动变化:b值方法,两种地震平静评估方法,以及地震活动密度的空间和时间分析。粗糙模式的空间范围从一种方法到另一种方法是不同的,并且范围从局部尺度(典型地,粗糙体尺寸)到区域尺度(例如,2度x3度围绕源区)。地震之前有明显的异常周期,持续时间为年(1.5年)或更长(> 3年)。我们证明了多种方法的组合检测到不同的信号之前,熊本地震。这表明,相对于长期地震危险性评估,在未来可能发生地震的地点减少危险的潜力很大。我们还发现,使用两种地震平静评估方法检测到的区域尺度区域的地震平静是2016年熊本地震和2015年萨摩半岛地震的共同前兆。这一结果使我们能够将这两次地震解释为发生在从冲绳海槽到别府-岛原地堑的构造线上的一个剖面上。

英文摘要:

We report precursory seismic patterns prior to the 2016 Kumamoto earthquakes, as measured by four different methods based on changes in seismicity that can be used for earthquake forecasting: the b-value method, two methods of seismic quiescence evaluation, and an analysis of seismicity density in space and time. The spatial extent of precursory patterns differs from one method to the other and ranges from local scales (typically, asperity size) to regional scales (e.g., 2 degree x 3 degree around the source zone). The earthquakes were preceded by periods of pronounced anomalies, which lasted in yearly scales (1.5 years), or longer (> 3 years). We demonstrate that a combination of multiple methods detected different signals prior to the Kumamoto earthquakes. This indicates great potential to reduce the hazard at possible future sites of earthquakes relative to long-term seismic hazard assessment. We also found that the seismic quiescence in a regional scale area, detected by using the two methods of seismic quiescence evaluation, was a common precursor to the 2016 Kumamoto earthquakes and 2015 Off Satsuma Peninsula earthquake. The result allows us to interpret both events as the onset that occurred at a section along the tectonic line from the Okinawa Trough through the Beppu-Shimabara graben.

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