The centroid moment tensor solution of the 13 February 2021 MW7.2 earthquake in the east coast of Honshu,Japan
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关键词:
- 日本本州东海岸MW7.2地震 /
- 矩心矩张量解 /
- 断层参数 /
- 体波反演
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图 1 日本本州东海岸MW7.2地震矩心矩张量解反演过程
(a) 矩心时间τc搜索;(b) 矩心水平空间搜索,黄色圆圈表示矩心水平坐标;(c) 矩心深度hc搜索;(d) 矩心相对震中的位置,红色沙滩球表示矩心矩张量解,红色星形表示震中
Figure 1. Inversion process of the centroid moment tensor solution for the MW7.2 earthquake in the east coast of Honshu,Japan
(a) Search for centroid time τc;(b) Search for the horizontal location of the centroid (yellow circle);(c) Search for centroid depth hc; (d) The centroid location (beach-ball) with respect to the instrumental epicenter (red hexagon)
图 4 2011年MW9.1地震(灰色沙滩球)后M>2.5事件以及本州东海岸MW7.2地震的余震分布和各机构发布的该主震的矩心矩张量反演结果
Figure 4. The centroid moment tensor solutions (colored beach-balls) from various institutions and aftershocks of the MW7.2 earthquake in east coast of Honshu as well as the M>2.5 earthquakes since the 2011 MW9.1 earthquake (gray beach-ball)
表 1 GCMT,USGS 和本研究所得日本本州东海岸MW7.2地震矩心矩张量解
Table 1 The centroid moment tensor solutions for the MW7.2 earthquake in the east coast of Honshu,Janpan,from GCMT,USGS and this study
机构 矩张量/(1019 N·m) 矩心参数 Mrr Mtt Mpp Mrt Mrp Mtp τc/s 北纬/° 东经/° 矩心深度/km GCMT (2021) 5.540 −0.647 −4.890 0.269 −1.760 −1.740 9.6 37.60 141.63 50.7 USGS (2021)(W震相) 4.557 −0.220 −4.337 0.724 −0.773 −1.550 13.2 37.63 141.88 60.5 USGS (2021)(体波) 5.964 −1.531 −4.434 0.313 −2.151 −1.156 − 37.75 141.72 50.6 本文 8.588 −0.147 −8.440 −0.217 −2.755 −1.000 12.0 37.65 141.45 50.0 表 2 GCMT,USGS以及本研究得到的日本本州东海岸MW7.2地震的最佳双力偶解
Table 2 The best double-couple solutions for the MW7.2 earthquake in the east coast of Honshu,Japan,from USGS,GCMT and this study
机构 标量地震矩
/(1019 N·m)双力偶
成分占比节面Ⅰ 节面Ⅱ 走向/° 倾角/° 滑动角/° 走向/° 倾角/° 滑动角/° GCMT (2021) 5.800 99% 192 53 80 28 38 103 USGS (2021)(W震相) 4.831 96% 187 49 74 30 43 107 USGS (2021)(体波) 5.903 61% 191 55 82 25 35 102 本文 9.008 100% 186 54 89 7 36 91 -
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