地震
地震
지진
EARTHQUAKE
2009年
4期
23-31
,共9页
洪顺英%申旭辉%单新建%刘智荣%戴娅琼%荆凤
洪順英%申旭輝%單新建%劉智榮%戴婭瓊%荊鳳
홍순영%신욱휘%단신건%류지영%대아경%형봉
改则地震%D-InSAR%同震形变%视线向形变%断层
改則地震%D-InSAR%同震形變%視線嚮形變%斷層
개칙지진%D-InSAR%동진형변%시선향형변%단층
the 2008 Gaize earthquake%D-InSAR%Coseismic deformation%LOS deformation
2008年1月9日在西藏改则地区发生6.9级地震,接着1月16日又发生6.0级余震,表现为双震型. 本文利用差分干涉测量技术(D-INSAR),通过对欧空局ASAR数据进行处理获取了其同震干涉形变场. 通过分析表明:改则地震干涉形变场呈双贝壳状,影响范围约33 km×30 km,以北东向地震破裂带为分界线分为西北视线向沉降盘与东南视线向隆升盘,最大视线向沉降形变量约53.2 cm,最大视线向隆升形变量约11.3 cm. 西北沉降盘又存在东、西两个形变中心,推测西部形变中心受6.0级余震的控制,东部形变中心受6.9级主震的控制. 宏观震中位置应位于左旋走滑改则-洞错断裂与依布茶卡-日干配错断裂的分阶部位(左阶),构造应力场以张性拉伸为主,导致地震破裂为典型的正断层破裂,与此次地震的干涉形变场特征及哈佛大学震源机制解吻合.
2008年1月9日在西藏改則地區髮生6.9級地震,接著1月16日又髮生6.0級餘震,錶現為雙震型. 本文利用差分榦涉測量技術(D-INSAR),通過對歐空跼ASAR數據進行處理穫取瞭其同震榦涉形變場. 通過分析錶明:改則地震榦涉形變場呈雙貝殼狀,影響範圍約33 km×30 km,以北東嚮地震破裂帶為分界線分為西北視線嚮沉降盤與東南視線嚮隆升盤,最大視線嚮沉降形變量約53.2 cm,最大視線嚮隆升形變量約11.3 cm. 西北沉降盤又存在東、西兩箇形變中心,推測西部形變中心受6.0級餘震的控製,東部形變中心受6.9級主震的控製. 宏觀震中位置應位于左鏇走滑改則-洞錯斷裂與依佈茶卡-日榦配錯斷裂的分階部位(左階),構造應力場以張性拉伸為主,導緻地震破裂為典型的正斷層破裂,與此次地震的榦涉形變場特徵及哈彿大學震源機製解吻閤.
2008년1월9일재서장개칙지구발생6.9급지진,접착1월16일우발생6.0급여진,표현위쌍진형. 본문이용차분간섭측량기술(D-INSAR),통과대구공국ASAR수거진행처리획취료기동진간섭형변장. 통과분석표명:개칙지진간섭형변장정쌍패각상,영향범위약33 km×30 km,이북동향지진파렬대위분계선분위서북시선향침강반여동남시선향륭승반,최대시선향침강형변량약53.2 cm,최대시선향륭승형변량약11.3 cm. 서북침강반우존재동、서량개형변중심,추측서부형변중심수6.0급여진적공제,동부형변중심수6.9급주진적공제. 굉관진중위치응위우좌선주활개칙-동착단렬여의포다잡-일간배착단렬적분계부위(좌계),구조응력장이장성랍신위주,도치지진파렬위전형적정단층파렬,여차차지진적간섭형변장특정급합불대학진원궤제해문합.
On 9 January,2008, an M_S6.9 earthquake happened in Gaize region(Tibet), with an M_S6.0 aftershock on 16 January, it is a typical double-earthquake. This paper uses the ESA ASAR SLC data to analyse the coseismic deformation characteristics of the Gaize earthquake by the Differential Interferometric Synthetic Aperture Radar(D-InSAR).The analysis indicate that the interferogram is dual-shell shape, about 33 km×30 km in extension. And it is divided into two parts by the NE-direction earthquake rupture, the northwest slant rang esubsides and the southeast slant range ascends. The max slant range chang esubsides about 53.2 cm, the max slant range change ascends about 11.3 cm. There are two deformation centers at the northwest subside part. It is speculated that the west deformation center is controlled by the M_S6.0 aftershock, and the east deformation center is controlled by the M_S6.9 earthquake. The macroscopical seismic center is located at the apart position(left step) of Laevo strike slip fault of Gaize-Dongcuo fault and Yibuchaka-Riganpeicuo fault, the tensile stress of this apart position leads to the typical normal fault fracture of the Gaize earthquake, and this accords with the interferogram characteristics and the Harvard mechanism.