东南沿海地震带20世纪第Ⅳ活跃幕的两个特征
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摘要
研究了东南沿海地震带20世纪第Ⅳ活跃幕的两个特征,包括该带中强地震与阳江地震窗的对应关系以及该带ML4地震长时间平静的震兆意义。结果表明:在第Ⅳ活跃幕中,阳江地区ML3地震(去余震)的活跃不仅与本区5级左右地震活动有关,还与东南沿海地震带5级以上强震活动有关,震前阳江地区ML3地震滑动3月频次出现升高现象,阳江地区ML3地震活动可作为东南沿海地震带的地震"窗口";在东南沿海地震带活跃幕期间,ML4地震发震间隔△T≥300d具有震兆意义,是5级地震的短期或中短期指标,而在平静幕期间,ML4地震的长时间平静并不具备震兆意义,只是区域应力场处于松弛状态下的正常表现。
We studied the two characteristics of the Ⅳ active episodes in seismic belt of Southeast China coast in 20th century. The one is the corresponding relation between the southeast coastal seismic belt and the Yangjiang seismic window,the other one is the seismic precursory significance about ML4 earthquakes which wasn't occurred for a long time. The results showed that the active of ML3 earthquakes in Yangjiang were affected not only by M5 earthquakes occurred in Yangjiang,but also by M>5 moderate-strong earthquakes occurred in seismic belt of Southeast China coast in Ⅳ active episodes. Before the moderate-strong earthquakes,occurrence frequency of ML3 earthquakes in the slip with every 3 months in Yangjiang raised,so ML3 earthquakes in Yangjing can be as the seismic window in seismic belt of Southeast China coast. In active episodes of seismic belt of Southeast China coast,the occurrence time interval △T≥300 d of ML4 earthquake was the index of M5 earthquake in short-term or medium-short term prediction. However,ML4 earthquakes weren't occurred for a long time,which were normal appearances of the regional stress field in relaxed state.However it wasn't the seismic precursory significance in quiet episodes.
We studied the two characteristics of the Ⅳ active episodes in seismic belt of Southeast China coast in 20th century. The one is the corresponding relation between the southeast coastal seismic belt and the Yangjiang seismic window,the other one is the seismic precursory significance about ML4 earthquakes which wasn't occurred for a long time. The results showed that the active of ML3 earthquakes in Yangjiang were affected not only by M5 earthquakes occurred in Yangjiang,but also by M>5 moderate-strong earthquakes occurred in seismic belt of Southeast China coast in Ⅳ active episodes. Before the moderate-strong earthquakes,occurrence frequency of ML3 earthquakes in the slip with every 3 months in Yangjiang raised,so ML3 earthquakes in Yangjing can be as the seismic window in seismic belt of Southeast China coast. In active episodes of seismic belt of Southeast China coast,the occurrence time interval △T≥300 d of ML4 earthquake was the index of M5 earthquake in short-term or medium-short term prediction. However,ML4 earthquakes weren't occurred for a long time,which were normal appearances of the regional stress field in relaxed state.However it wasn't the seismic precursory significance in quiet episodes.
引文
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敖雪明,王桂岭,吴小玲,等.1996.姑咱地震窗异常于地震的关系[J].华南地震,16(4):34-39.
敖雪明,王桂岭,周仕勇,等.1994.新疆地震窗口网在强震短临跟踪预报中的应用研究[J].地震学报,16(增刊):56-66.
程万正.1984.前兆地震活动“窗口”或敏感部位的寻找及有效性估计[J].地震研究,7(6):657-666.
冯绚敏,黄福明,易志刚,等.1998.广东省未来十年强震趋势分析[J].华南地震,12(2):1-9.
姜秀娥,单锦芬.1982.华北强地震余震震群应力场“窗口”效应[J].西北地震学报,4(4):41-46.
李海华,吴德珍,马秀芳.1996.沿海地区13年强震危险性的层次分析[J].灾害学,11(4):30-34.
刘小凤,梅秀萍,张小美.2003.青藏高原北部地区地震窗口特征及其预报意义[J].西北地震学报,25(4):359-364.
吕坚,张福平,高建华,等.2003.东南沿海地震带的地震丛集窗及震级结构特征分析[J].地震,23(1):83-89.
马宗晋.1980.华北地壳的多(应力集中)点场与地震[J].地震地质,2(1):39-47.
彭美凤,林世美.1996.东南沿海地震形势分析[J].地震,16(2):197201.
任镇寰,罗振暖,华卫.2002.粤闽赣交界地区地震活动若干特征及其地震大形势分析[J].华南地震,22(3):28-38.
魏柏林,冯绚敏,陈定国,等.2001.东南沿海地震活动特征[M].北京:地震出版社.
钟贻军,任镇寰.2003.1969年阳江6.4级地震发震构造研究[J].大地测量与地球动力学,23(4):92-98.
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