1991年12月9日夜,夏威夷东南太平洋海底洛伊希火山像往常一样又突然震动起来。过了12个小时震动又嘎然而止。震动总次数超过400次,其中有16次震动的震级大于里氏3级。经火山观测人员的测定,火山地震的震源集中在海底之下超过10m的深度处。洛伊希火山的顶峰位于海平面以下980m深处,而且一 On the night of December 9, 1991, the Loessic volcano in the southeastern Pacific Ocean of Hawaii shook itself as usual. After 12 hours of vibration and came to an end. The total number of vibration over 400 times, of which 16 times the magnitude of the shock than Richter 3. According to the volcanic observers’ determination, the source of the volcanic earthquake concentrated at a depth of more than 10m below the seafloor. Loisir Peak is located 980 meters below sea level deep, and one