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首页> 外文期刊>Journal of geodynamics >Localized changes in geomagnetic total intensity values prior to the 1995 Hyogo-ken Nanbu (Kobe) earthquake
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Localized changes in geomagnetic total intensity values prior to the 1995 Hyogo-ken Nanbu (Kobe) earthquake

机译：1995年兵库县南部（神户）地震前地磁总强度值的局部变化

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摘要

Changes in total geomagnetic field intensity, of 2-3 nT, were observed prior to the 1995 Hyogo-ken Nanbu (Kobe) earthquake at the Amagase (AMG) site, located approximately 70 km from the epicenter. We examined whether the observed variations are local signals arising from the Earth's crust, or global variations that are unlikely to originate from the crust. To remove global-scale variations in total geomagnetic intensity data, we employed a regional geomagnetic field model. Using data recorded at five reference sites in Japan, we estimated global-scale variations in total geomagnetic intensity, and removed them from the observed total geomagnetic intensity at the AMG site. The reminder still showed variations during the period prior to the Kobe earthquake. In addition, these pre-seismic variations include two of the largest shifts recorded during the entire observation period at the AMG site, raising the possibility that these variations were indeed related to the earthquake. These variations cannot be interpreted as signals arising from the area close to the seismic source because of the large distance between the epicenter and the site. Therefore, our results raise the possibility that the physical state of the Earth's crust shows marked changes over a wide region in the lead-up to a seismic event.
机译：在距震中约70公里的Amagase（AMG）站点的1995年兵库县南部南部（神户）地震之前，观测到总地磁场强度发生了2-3 nT的变化。我们检查了观察到的变化是由地壳引起的局部信号还是由地壳引起的全局变化。为了消除总地磁强度数据的全球尺度变化，我们采用了区域地磁场模型。使用在日本五个参考站点记录的数据，我们估算了总地磁强度的全球规模变化，并将其从AMG站点观测到的总地磁强度中删除。提醒仍然显示出神户地震前这段时期的变化。此外，这些地震前变化包括整个AMG站点整个观测期间记录到的最大位移中的两个，这增加了这些变化确实与地震有关的可能性。由于震中与场地之间的距离较大，因此这些变化不能解释为源自靠近地震源的区域的信号。因此，我们的结果提出了在发生地震之前，地壳的物理状态在较宽的区域内显示出明显变化的可能性。

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