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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 >Synchronous changes in the seismicity rate and ocean-bottom hydrostatic pressures along the Nankai trough:. A possible slow slip event detected by the Dense Oceanfloor Network system for Earthquakes and Tsunamis (DONET)
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Synchronous changes in the seismicity rate and ocean-bottom hydrostatic pressures along the Nankai trough:. A possible slow slip event detected by the Dense Oceanfloor Network system for Earthquakes and Tsunamis (DONET)

机译：沿南开海槽地震活动率和海底静水压力的同步变化：密集海底网络系统检测到的可能的慢滑事件，用于地震和海啸（DONET）

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We detected long-term hydrostatic pressure changes at ocean-bottom stations of the Dense Oceanfloor Network system for Earthquakes and Tsunamis (DONET) along the Nankai trough, off southwestern Japan. We detected these changes after removing the contributions of ocean mass variations and sensor drift from the records. In addition, we detected a decrease in the background seismicity rate of a nearby earthquake cluster that was synchronous with the hydrostatic pressure changes. We interpreted these observed hydrostatic pressure changes to reflect vertical deformation of the ocean floor of 3-8 cm, and we consider the cause of the seafloor crustal deformation to be a slow slip event (SSE) beneath the stations. Because the pressure changes were observed at stations with distances less than 20 km to each other, we inferred that the SSE occurred in the shallow part of the sedimentary wedge, such as on a splay fault system. The synchronous observation of an SSE and a seismicity rate change suggests that both were triggered by a change in the regional stress that may be associated with stress accumulation and release processes occurring along the Nankai trough. These data show that continuous and careful monitoring of crustal activities by DONET stations provides an effective way to detect seismic and geodetic signals related to the occurrence of megathrust or other types of large earthquakes. (C) 2016 The Authors. Published by Elsevier B.V.
机译：我们在日本西南部南海海槽的密集海底地震和海啸网络（DONET）的海底站处检测到长期静水压力变化。从记录中删除了海洋质量变化和传感器漂移后，我们检测到了这些变化。此外，我们检测到附近静水地震群的背景地震活动率与静水压力变化同步下降。我们解释了这些观测到的静水压力变化，以反映3-8厘米海底的垂直变形，并且我们认为海底地壳变形的原因是台站下方的缓慢滑动事件（SSE）。由于在距离相距小于20 km的站点上观测到压力变化，因此我们推断SSE发生在沉积楔的浅部，例如张开断层系统。 SSE和地震活动率变化的同步观测表明，这两者都是由区域应力的变化触发的，这可能与沿南海海槽发生的应力积累和释放过程有关。这些数据表明，通过DONET站对地壳活动进行连续而仔细的监视，为检测与巨推力或其他类型的大地震的发生有关的地震和大地信号提供了有效的方法。 （C）2016作者。由Elsevier B.V.发布

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