云南孟连中缅边境M_S7.3地震前滇西实验场的重力变化

GRAVITY VARIATION IN THE WESTERN YUNNAN EARTHQUAKE PREDICTION TEST SITE (WYEPTS) BEFORE THE M_S7.3 EARTHQUAKE OCCURRENCE ON THE BORDER BETWEEN CHINA AND MYANMAR TO THE WEST OF MENGLIAN, YUNNAN PROVINCE

1995年 7月 1 2日 ,在云南省西南部的孟连县以西中缅边境发生了一次 MS7.3强烈地震。震前 ,距震中 2 80 km以远的滇西实验场重力网红河断裂以西出现了重力异常 ,平均变化幅值达 70× 1 0 - 8ms- 2 ,最大变化幅值达 1 1 4× 1 0 - 8ms- 2 ,云南省地震工程研究所测量队重力组根据上述重力异常变化 。

On 12 July 1995, a strong earthquake with M S 7.3 occurred on the border between China and Myanmar, to the West of Menglian, Yunnan Province, and the gravity anomaly was detected by the gravity network of WYEPTS that located to the West of the Red River fault 280 km away from the epicenter, with the average variation value of 70×10 -8 ms -2 and the maximum variation value of 114×10 -8 ms -2 . The Gravity group of Survey team, Institute of Earthquake Engineering of Yunnan Province has given a good medium short term prediction for this earthquake according to the anomalous variation in gravity.