發(fā)布時(shí)間：2018-06-02 00:42

  本文選題：凱庫拉MW.地震 + 地表破裂帶　； 參考：《地震地質(zhì)》2017年04期

【摘要】：新西蘭2016年凱庫拉M_W7.8地震地表破裂帶分布在1個(gè)長(zhǎng)約170km、寬35km的范圍內(nèi),總體呈NE-SW走向,至少有12條斷裂產(chǎn)生了m量級(jí)的地表位錯(cuò),跨過了2個(gè)活動(dòng)方式與活動(dòng)強(qiáng)度存在明顯差異的地震構(gòu)造區(qū)。地震地表斷裂大致可分為NE—NEE向和NNW—近SN向2組,NE—NEE向斷裂之間的貫通性差,最大相隔距離為25~30km,即使首尾相連,走向上也有約30°的差異,運(yùn)動(dòng)性質(zhì)以右旋走滑為主,最大位錯(cuò)量10~12m;NNW—近SN向斷裂近于平行分布,相距可達(dá)40~50km,以逆斷裂活動(dòng)性質(zhì)為主,最大垂直位錯(cuò)量5~6m。走滑類地表破裂帶的組合特征非常復(fù)雜,主要表現(xiàn)為3種形式:雁列、分叉和平行分布。其中,雁列地表破裂(段)既可以表現(xiàn)為數(shù)m至數(shù)十m尺度上的張剪性破裂與鼓包、擠壓剪切破裂組合,也可表現(xiàn)為百余m長(zhǎng)的左階斜列張剪性破裂組合;地表破裂段之間階區(qū)規(guī)模差異明顯,可以是數(shù)十m、數(shù)百m到數(shù)km不等。平行的地表破裂(段)可以相距數(shù)m、數(shù)十m至數(shù)km。凱庫拉地震地表破裂帶對(duì)已知活動(dòng)斷裂分布格局的突破也是1種比較顯著的特點(diǎn),既可以是在原先認(rèn)為不活動(dòng)的斷裂上或沒有活動(dòng)斷裂的位置上產(chǎn)生了地表破裂帶,也可以是在走向或橫向上突破了先前認(rèn)識(shí)到的活動(dòng)斷裂分布范圍。對(duì)凱庫拉地震地表破裂帶發(fā)育特征的初步分析結(jié)果,對(duì)于理解地表活動(dòng)斷裂與深部發(fā)震構(gòu)造之間復(fù)雜的對(duì)應(yīng)關(guān)系,以及跨活動(dòng)斷裂的抗震設(shè)防等問題具有一定的借鑒意義。
[Abstract]:The surface rupture zone of the 2016 Kaikula M_W7.8 earthquake in New Zealand is distributed in the range of about 170 km long and wide 35km, and is generally NE-SW strike. At least 12 faults have produced surface dislocations of m magnitude. Two seismic tectonic areas with obvious differences in activity patterns and activity intensities have been crossed. The seismic surface faults can be roughly divided into two groups: NE-NEE direction and NNW-near SN direction. The maximum distance between them is 25 ~ 30km. Even if the top and the tail are connected, there is a difference of about 30 擄on the strike, and the movement is mainly dextral strike-slip. The maximum dislocation amount is 10 ~ 12 m ~ (-1) NNW-NNW-NNW-NNW-NNW-NNW-NNW-NNW-NNW-NNW-NNW-NNW-NNW-NNW-NNW-NNW-NNW-NNW@@ The assemblage characteristics of strike-slip surface rupture zones are very complex, mainly in three forms: geese, bifurcation and parallel distribution. Among them, the echelon surface rupture (segment) can be shown either as tensional shear rupture and bulge on the scale of several meters to tens of meters, compression shear rupture combination, or the left-order diagonal tensional shear fracture combination with a length of more than 100 m. The scale of the order of the surface rupture segment is obviously different, which can be tens of meters, hundreds of meters to several kilometers. Parallel surface rupture (segments) can be separated by several meters, tens of meters to several kms. The breakthrough of the surface rupture zone of the Kaikula earthquake to the known active fault distribution pattern is also a relatively remarkable feature, which can be characterized by the occurrence of the surface rupture zone on the previously considered inactive fault or in the position where there is no active fault. It can also break through the previously recognized range of active faults in the direction or transverse direction. The preliminary analysis of the development characteristics of the surface rupture zone of the Kaikula earthquake has certain reference significance for understanding the complex corresponding relationship between the surface active faults and the deep seismogenic structures, as well as the seismic fortification across the active faults.
【作者單位】： 中國(guó)地震局地質(zhì)研究所;Institute
【基金】：國(guó)家自然科學(xué)基金(41372219,41172193)資助
【分類號(hào)】：P315.2

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