Quantitative examination of regional interaction among active faults

为了更好地了解大地震的震级和复发模式，我们定量地研究了活动逆断层之间的区域相互作用。我们对WFZNB（长野盆地西缘逆断层带）进行了深入调查。我们的研究结果表明，复发间隔是相对不规则的最近四个大地震，虽然同震垂直位移几乎是相同的，在个别网站。需要进一步研究WFZNB与ISTL（Itoigawa-Shizuoka Tectonic Line）活动断裂带北方部分之间的古地震关系。

We examined regional interaction among active reverse faults quantitatively, to better understand magnitudes and recurrence patterns of large earthquakes. We conducted intensive surveys on the WFZNB (western margin reverse-fault zone of the Nagano basin). Our results imply that recurrence intervals are relatively irregular for the latest four large earthquakes although coseismic vertical displacements are almost the same at individual sites. Further investigations are needed to examine paleoseismic relationship between the WFZNB and the northern part of the ISTL (Itoigawa-Shizuoka Tectonic Line) active fault zone.