|
|
荣昌地区注水地震研究 |
朱丽霞 ;黄世源; 魏红梅 |
(重庆市地震局,重庆 401147) |
|
ONFLUIDINJECTIONINDUCEDEARTHQUAKEINRONGCHANGAREA |
ZhuLixia;HuangShiyuan;WeiHongme |
(EarthquakeAdministrationofChongqingMunicipality,Chongqing 401147) |
|
摘要 2006年荣昌地区的地震活动显著活跃,发生有感地震9次,现场考察发现当地采气作业的废水注入状态有所改变。分析了注水和地震活动的关系,并从构造背景、震源机制解等方面讨论了荣昌地震的可能机制,认为荣昌地区5.0级左右破坏性地震的发生受四川盆地区域应力场控制,人为注水引发的频繁小震活动改变了局部渗流和孔隙压,促使裂隙扩张并导致大破裂产生。
|
|
关键词 :
注水地震,
孕震模式,
华蓥山基底断裂,
孔隙压荣昌地区
|
Abstract: TheseismicactivityinRongchangareaofChongqingin2006wasremarkableandninefeltearth quakesoccurred.Theinvestigationonearthquakesitesdiscoveredthattheconditionofthewastewaterpourshad changed.Therelationofpouredwaterwiththeseismicactivityisanalyzed,andthepossiblefocaldevelopment pattern ofthe Rongchangearthquakeisdiscussedfromthetectonicbackground,thefocalmachanismsolutionandsoon.ItisconsideredthattheseismogenicmodelofRongchangdestructiveearthquake(aboutMs5.0)iscontroledby thelocalstressfieldinSichuanbasin.Thepouredwatercausesfrequentsmallearthquakesandchangesthepartial infiltrationandtheporepressure,finallycausesthecracktoexpandandtherupturetooccur. |
Key words:
fluidinjectioninducedearthquake
seismogenicmodel
Huayingshanbasementfault
porewaterpressure
Rongchangarea
|
收稿日期: 1900-01-01
|
通讯作者:
朱丽霞
|
|
|
|