ANALYSIS OF THE VOLUME STRAIN DATA FROM THE SHANDAN IN-SITU STRESS MONITORING STATION
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摘要: 本文简要介绍了山丹地应力监测台站的概况, 用多种方法对该台站安装的TYB-2000A体应变仪在2007年8月至2008年7月记录的174次肘Ms4.0~Ms8.6地震数据进行了处理与分析, 其中汶川地震及余震共85次, 并与其他台站记录的地震资料进行比对, 对记录的应变地震波、同震应变阶跃、地震前后地球自由振荡的变化及其所包含的物理意义等信息深入分析, 揭示出地震前后应变波的变化规律, 为今后的地震预测和灾害防治提供了科学依据.Abstract: The authors analyzed the volume strain data recorded from July 2007 to July 2008 in the Shandan in-situ stress monitoring station by using the statistical method, made a correlation of these seismic data with those recorded from other stations and studied the strain seismic waves, comseismic strain step and its contained physical significance, thus revealing the nature of the seismic strain waves.The data trends had pronounced anomalies.The effect of comseismic variation observed by the volume strain seismograph in the Shandan in-situ stress monitoring station was mainly the tensional step.
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图 1 2007年9月12日印尼苏门答腊南部海中MS8.5级地震应变地震波
Figure 1. Seismic strain wave of the MS8.5 earthquake in southern Sumatra in the sea, Indonesia, on September 12, 2007
图 2 2008年3月21日于田MS7.3级地震应变地震波
Figure 2. Seismic strain wave of the MS7.3 earthquake at Yutian in March 21, 2008
图 3 2008年7月19日日本本州东海岸近海MS7.3级地震应变地震波
Figure 3. Seismic strain wave of the MS7.3 earthquake at the east coast of Japan's Honshu, on July 19, 2008
图 4 2008年5月30日发生在青川4.0级余震引起的振荡
Figure 4. Oscillations of 4.0 aftershock at Qingchuan, on May 30, 2008
图 5 2008年07月17日06: 58: 22在青海唐古拉西5.3级地震前后的地球自由振荡
Figure 5. The Earth's free oscillations before and after MS 5.3 earthquake west of Tanggula Mountains, Qinghai at 06: 58: 22 on July 17, 2008
图 6 2008年07月13日台湾恒春海域MS6.0级地震前后的地球自由振荡
Figure 6. The Earth's free oscillations before and after MS6.0 earthquake in the sea area of Hengchun, Taiwan, on July 13, 2008
图 7 2008年5月12日19: 10: 58汶川6.0级余震应变曲线(汶川8.0级地震余震)
Figure 7. Strain curve of the MS6.0 Wenchuan aftershock at 19: 10: 58, May 12, 2008(aftershock of the MS8.0 Wenchuan earthquake)
图 8 2008年5月13日15时07分汶川6.1级余震应变曲线(汶川8.0级地震余震)
Figure 8. Strain curve of the MS6.1 Wenchuan aftershock at 15: 07, May 13, 2008(aftershock of the MS8.0 Wenchuan earthquake)
图 9 2008年5月14日10时54分汶川5.6级余震应变曲线(汶川8.0级地震余震)
Figure 9. Strain curve of the MS 5.6 Wenchuan aftershock at 10: 54, May 14, 2008(aftershock of the MS8.0 Wenchuan earthquake)
图 10 2008年5月12日14点28分地应变监测曲线(汶川8.0级地震)
Figure 10. Strain monitoring curve at 14: 28, May 12, 2008(aftershock of the MS8.0 Wenchuan earthquake)
图 11 2007年8月16日07: 40: 58在秘鲁海岸近海MS7.8级地震产生负应变阶跃
Figure 11. Negative strain step of MS7.8 earthquake in the coast of Peru at 07: 40: 58, August 16, 2007
图 12 2007年9月20日16: 31: 13在印尼苏门答腊南部海中MS6.9地震产生负应变阶跃
Figure 12. Negative strain step of MS6.9 earthquake in the sea south of Sumatra, Indonesia at 16: 31: 13, September 20, 2007
图 13 汶川8.0级地震前应变前兆异常分布图(2008.5.10 ~ 5.14)
Figure 13. The distribution of strain anomaly before the MS8.0 Wenchuan earthquake (2008.5.10 ~ 5.14)
图 14 于田7.3级地震前一天(2008.3.20)应变阶跃
Figure 14. Strain step on the day before the MS7.3 Yutian earthquake (2008.3.20)
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