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首页> 外文期刊>Earth, planets and space: EPS >Aftershock observation of the 2003 Tokachi-oki earthquake by using dense ocean bottom seismometer network
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Aftershock observation of the 2003 Tokachi-oki earthquake by using dense ocean bottom seismometer network

机译：通过使用密集的海底地震计网络来观察2003年Tokachi-OKI地震

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摘要

The Tokachi-Oki earthquake occurred on September 26, 2003. Precise aftershock distribution is important to understand the mechanism of this earthquake generation. To study the aftershock activity, we deployed forty-seven ocean bottom seismometers (OBSs) and two ocean bottom pressure meters (OBPs) at thirty-eight sites in the source region. We started the OBS observation four days after the mainshock for an observation period of approximately two months. In the middle of the observation period, nine OBSs near the epicenter of the mainshock were recovered to clarify the depth distribution of aftershocks near the mainshock. From the data overall OBS, seventy-four aftershocks were located with high spatial resolution. Most of the aftershocks were located in a depth range of 15-20 km and occurred within the subducting oceanic crust, the 5.5-km/s layer of the landward plate and the plate boundary. No aftershocks were found in the mantle of the subducting plate. The low seismic activity beneath the trench area where the water depth is greater than about 2000 m suggests a weak coupling between the two plates. The depth of the mainshock is inferred to be 15-20 km from the aftershock distribution.
机译：Tokachi-Oki地震发生于2003年9月26日。精确的余震分布对于了解这种地震发电的机制非常重要。为研究余震活动，我们在源区的三十八个地点部署了四十七个海底地震仪（OBS）和两个海底压力表（OBP）。我们在主斯克岛后四天开始观察，在大约两个月的观察期。在观察期间，恢复了主震震中附近的九个OBS，以澄清主斯克克地区附近余震的深度分布。从数据的整体OBS，七十四个余震位于空间分辨率高。大多数余震位于15-20公里的深度范围内，发生在凸面的海底地壳中，落地板的5.5厘米/厘米和板边界。在底板板的地幔中没有发现余震。水深大于约2000μm的沟槽区域下面的低震活动表明两个板之间的弱耦合。主轴的深度被推断为距离余震分布15-20公里。

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