【摘要】 研究给出四川地区跨断层短水准、短基线和固定形变台在汶川8.0级地震前出现的异常现象。四川地区跨断层流动垂直、水平形变观测场地观测,在汶川8.0级地震前出现中长期趋势异常的场地数为6个,1个为长期趋势异常,其余5个为中期趋势异常,异常观测场地比为6∕31=0.19。其中,龙门山断裂带所在的川北地区有4处跨断层流动短水准观测场地,排除影响因素后未分析得到异常项。蒲江—新津断裂带存在1项中期趋势异常。鲜水河断裂带流动短水准、短基线在汶川8.0级地震前出现中长期趋势异常的场地比是4∕18=0.22;6个半地下动态蠕变观测场地未出现异常项。安宁河—则木河断裂带流动短水准、短基线在汶川8.0级地震前出现中长期趋势异常的场地比是1∕8=0.13。对四川地区6项流动形变"疑似异常"给予说明。汶川8.0级地震前四川地区地倾斜类出现观测异常台站比是2/12=0.17;出现中长期趋势异常的观测异常测项比是5/40=0.13。另外对有争议的观测异常现象给出必要的说明。同时给出四川地区2002年1月至2008年4月四川地区周、月震情会商给出的地形变异常观测项数均值供分析比较。更多还原

【Abstract】 The crust deformation anomaly data we analyzed in the paper include the following observatories of fixed mark-stones with the methods of the fault crossing short range leveling and short baseline before the 2008 Wenchuan M8.0 Earthquake.There are 6 observatory sites with medium-term abnormal data changes and an observatory site with a long-term abnormal data changes among 31 observatory sites.In another words,the abnormal rate is 6/31.For 4 observatory sites distributed along the Longmenshan seismic faults with abnormal data changes,the abnormal changes are carefully recognized but these abnormal changes are caused by the activity of man-made.There is an abnormal data change along the Pujiang-Xingjin seismic faults.There are 4 observatory sites with medium-term and a long-term abnormal data changes along the Xianshuihe seismic faults among 18 observatory sites and the abnormal rate is 4/18.There were no abnormal data changes of length measurement with creep-meters installed half underground.There is only 1 observatory site with medium-term and a long-term abnormal data changes along the Anninghe-Zemuhe seismic faults among 8 observatory sites and the abnormal rate is 1/8.At the same time,there are 2 observatory sites with crust tilt meters among 12 observatory sites and the abnormal rate is 2/12.The abnormal rate with the medium-and long-term is 5/40.The abnormal phenomena reported in Sichuan region before the 2008 Wenchuan M8.0 Earthquake from January 2002 to April 2008 are mentioned.更多还原