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首页> 外文期刊>Earth, planets and space: EPS >Aftershock seismicity and fault structure of the 2005 West Off Fukuoka Prefecture Earthquake (M(JMA)7.0) derived from urgent joint observations
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Aftershock seismicity and fault structure of the 2005 West Off Fukuoka Prefecture Earthquake (M(JMA)7.0) derived from urgent joint observations

机译：从紧急联合观测中得出的2005年福冈县西海岸地震（M（JMA）7.0）的余震地震活动和断层结构

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摘要

On March 20, 2005, a large M(JMA)7.0 earthquake occurred in the offshore area, west of Fukuoka prefecture, northern Kyushu, Japan. A series of joint observations were carried out by teams from several universities in Japan with the aim of investigating the aftershock activity. Six online telemetered and 17 offline recording seismic stations were installed on land around the aftershock area immediately followed the occurrence of the mainshock. Because aftershocks were located mainly in offshore regions, we also installed 11 ocean bottom seismometers (OBSs) just above the aftershock region and its vicinity in order to obtain accurate locations of hypocenters. The OBS observation was carried out from March 27 to April 13, 2005. We further conducted temporary GPS observations in which ten GPS receivers were deployed around the aftershock region. The aftershocks were mainly aligned along an approximately 25-km-long NW-SE trend, and the hypocenters of the main aftershock region were distributed on a nearly vertical plane at depths of 2-16 km. The mainshock was located near the central part of the main aftershock region at a depth of approximately 10 km. The largest aftershock of M(JMA)5.8 occurred near the southeastern edge of the main aftershock region, and the aftershock region subsequently extended about 5 km in the SE direction as defined by secondary aftershock activity. Enlargement of the aftershock region did not occur after the peak in aftershock activity, and the aftershock activity gradually declined. The distribution of hypocenters and seismogenic stress as defined by aftershocks suggest that the 2005 West Off Fukuoka Prefecture Earthquake occurred on the fault that is the NW extension of the Kego fault, which extends NW-SE through the Fukuoka metropolitan area, and that the largest aftershock occurred at the northwestern tip of the Kego fault.
机译：2005年3月20日，日本九州北部福冈县以西的近海地区发生了M（JMA）7.0级大地震。来自日本几所大学的研究小组进行了一系列联合观测，目的是调查余震活动。地震发生后，在余震区附近的陆地上安装了六个在线遥测地震台和17个离线记录地震台。由于余震主要位于近海区域，因此我们在余震区域及其附近的上方还安装了11个海底地震仪（OBS），以获取震源的准确位置。 OBS观测是在2005年3月27日至4月13日进行的。我们还进行了临时GPS观测，在余震区域周围部署了十个GPS接收器。余震主要沿着大约25公里长的NW-SE趋势排列，主余震区的震源分布在2-16 km深度的近乎垂直的平面上。主震位于主余震区中心附近，深度约10 km。 M（JMA）5.8的最大余震发生在主余震区的东南边缘附近，随后余震区沿SE方向延伸了约5 km，这是次生余震活动所定义的。余震活动达到峰值后，未发生余震区域的扩大，余震活动逐渐下降。余震定义的震源和震源应力的分布表明，2005年福冈西部西部地震发生在断层，该断层是Kego断层的西北延伸，该断层将NW-SE延伸穿过福冈市区，并且是最大的余震。发生在Kego断层的西北端。

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