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对日本(Takeo,1998)和台湾地区(Huang et al,2006;Liu et al,2009)的地震近场测量显示,地面旋转运动的测量值比经典弹性理论得到的预期值高出很多倍。为了在地震学和地震工程学层面上研究近场地震的细节,台湾气象机构(CWB)在台湾嘉义中正大学布设了4套仪器,正在监测一个多世纪前的1906年曾发生过大地震的梅山活断层的地面旋转和平移运动。这次观测布设的仪器是:(1)在自由场地32个测点的地震台阵;(2)在大楼内32个测点的地震台阵;(3)带有宽频地震计和加速度计的6通道仪器;(4)带有加速度计和外设旋转速度传感器的6通道仪器。本文是有关该台阵布设的进展报告。虽然从2007年12月12日到2008年7月3日,所布设的4套仪器中的一套或多套已记录到24次近震,但我们仍在对设备进行升级,改善现场观测。
Near-field measurements of earthquakes in Japan (Takeo, 1998) and Taiwan (Huang et al, 2006; Liu et al, 2009) show that measured ground rotation is many times greater than what is expected from classical elastic theory. To study details of near-field earthquakes at the seismological and seismic engineering levels, the Taiwan Meteorological Organization (CWB) has installed four instruments at Chung Cheng University in Chiayi, Taiwan, and is monitoring Meishan, a Mega mountain that occurred more than 190 years ago in 1906 Active fault ground rotation and translational movement. The equipment for this survey is: (1) 32 seismic points in free field; (2) 32 seismic points in the building; (3) with broadband seismometer and accelerometer 6-channel instrument; (4) 6-channel instrument with accelerometer and peripheral rotation speed sensor. This article is a progress report on the layout of the array. Although 24 near-earthquakes have been recorded in one or more of the 4 sets of equipment deployed from December 12, 2007 to July 3, 2008, we are still upgrading our equipment to improve on-site observations.