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首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >Related spatio-temporal changes in hypocenters and the b value in the 2017 Kagoshima Bay swarm activity indicating a rise of hot fluids
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Related spatio-temporal changes in hypocenters and the b value in the 2017 Kagoshima Bay swarm activity indicating a rise of hot fluids

机译：kagoshima湾群活动中的Hypocenters和B价值的相关时空变化，表明热流体升高

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摘要

Spatio-temporal characteristics of the b value in relation to changes in hypocentral distribution and the occurrence rate of swarm earthquakes in the 2017 Kagoshima Bay activity were investigated. Noting stepwise changes in the area as well as the occurrence rate of swarm events, we divided the activity from December 2016 to October 2017 into six stages. Characteristics of the activity in each stage were clearly grasped when swarm area was divided into several rectangular zones in a NNW-SSE direction and when hypocenters and the b value in each zone were examined in detail. After the largest shock with a magnitude (M) of 5.3 on July 11, 2017, the swarm area expanded conspicuously. However, the dominant factor that played a leading role in the development of swarm activity was not the occurrence of the M 5.3 shock, but activity in the zone (zone B) just to the west of the focal region. The number of events in zone B was more than two times the whole number of events that occurred in the entire swarm area, except for zone B. The hypocentral distribution in zone B was relatively shallow from early stages, but the most notable feature was the abrupt diffusion of events to a shallower layer at the time of the M 4.4 shock on August 24, 2017. The b value in the central part of zone B was noticeably high from earlier stages, but remarkably high for the shallow events of the burst-like activity after the M 4.4 shock. From these spatio-temporal characteristics of hypocenters and the b value, we propose that hot fluids that had existed beneath the central part of zone B ascended at the time of the M 4.4 shock. Moreover, hot fluids were the major cause of the 2017 Kagoshima Bay swarm activity.
机译：研究了与2017年鹿儿岛湾活动中泄压型分布变化和群落地震变化相关的B值的时空特征。注意到该地区的逐步变化以及群体活动的发生率，我们将活动从2016年12月到2017年10月分为六个阶段。当群体地区分成NNW-SSE方向的几个矩形区域以及详细检查每个区域中的低舒张和B值时，清楚地掌握每个阶段的活动的特征。在2017年7月11日的最大震荡（M）为5.3的震荡之后，群地区明显地扩展。然而，在群体活动的发展中发挥着主导作用的主导因素并不是M 5.3休克的发生，而是在焦点区域西部的区域（B区）中的活动。 B区的事件的数量超过整个群地区发生的总事件的两倍以上，除了区域B. B区的斜视分布与早期阶段相对较浅，但最值得注意的特征是在2017年8月24日在M 4.4休克时突然扩散到较浅的层。区域B中央部分的B值与早期阶段明显高，但突发的浅事件显着高像M 4.4震惊后的活动。从这些低缩进者和B值的这些时空特征，我们提出了在B区B下方存在的热流体在M 4.4冲击时升高。此外，热流体是2017年鹿儿岛湾群活动的主要原因。

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