The southwestern Kuril trench is seismically active due to the subduction of the Pacific plate. Great earthquakes in this zone have frequently induced fatal disasters. Seismic monitoring and hypocenter catalogs provide fundamental information on earthquake occurrence and disaster mitigation. Real-time hypocenter and magnitude estimates are extremely crucial data for tsunami warning systems. However, this region is located in the international border zone between Japan and Russia. The Japan Meteorological Agency and Russian Academy of Sciences have routinely determined hypocenters and issued earthquake information independently. Waveform data have not yet been exchanged internationally in real time. Here, we evaluated how a hypothetical Japan–Russia joint seismic network could potentially improve the hypocenter estimation accuracy. Experiments using numerical and observed data indicated that the joint network extended the distance over which hypocenters can be accurately determined over 100 km eastward compared to the Japan network only. This fact suggests that joint seismic data have the potential to improve the hypocenter accuracy in this region, which would provide improved performance in gathering disaster information at the moment of a tsunami warning.

中文翻译：

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利用日俄联合地震资料评价西南千岛海沟震源估计误差

由于太平洋板块的俯冲，西南千岛海沟地震活跃。这一带的大地震经常引发致命的灾难。地震监测和震源目录提供有关地震发生和减灾的基本信息。实时震源和震级估计是海啸预警系统极其重要的数据。然而，该地区位于日本和俄罗斯之间的国际边境地带。日本气象厅和俄罗斯科学院定期确定震源并独立发布地震信息。波形数据尚未在国际上进行实时交换。在这里，我们评估了假设的日本-俄罗斯联合地震网络如何潜在地提高震源估计精度。使用数值和观测数据的实验表明，与仅日本网络相比，联合网络将可以准确确定震源的距离向东扩展了 100 多公里。这一事实表明，联合地震数据有可能提高该地区的震源精度，从而在海啸预警时提供更好的灾害信息收集性能。