PALEOSEISMIC RECORDS OF LARGE EARTHQUAKES ON THE CROSS-BASIN FAULT IN THE SALT LAKE PULL-APART BASIN AND CASCADE RUPTURE EVENTS ON THE HAIYUAN FAULT

doi:10.3969/j.issn.0253-4967.2016.04.003

Abstract

Abstract:

Cascade rupture events often occur along large strike-slip fault zone.The 1920 AD M 8¹/₂ earthquake ruptured all 3 segments of the Haiyuan Fault,and the Salt Lake pull-apart basin is the boundary between the west and middle segment of the fault.The data of trenching and drilling reveal 7 events occurring since last stage of late Pleistocene,and the two youngest events are associated with the historical records of 1092 AD (possibly) and 1920 AD respectively.These events are all large earthquakes with magnitude M>8,and the recurrence of them is characterized by earthquake clusters alternating with a single event.Now it is in the latest cluster which may last about 1000 years.Comparison of the paleoseismic sequence of this study and previous results reveals that the cross-basin fault in the Salt Lake pull-apart basin does not always rupture when cascade rupture events occur along the Haiyuan Fault,and likely ruptures only when the magnitude of the events is large (maybe M>8).Though there are many advantages in paleoseismic study in pull-apart basin,we should avoid getting the paleoseismic history of major strike-slip fault zones only depending on the rupture records of inner faults in pull-apart basins with large scale (maybe a width more than 3km).

Key words: Haiyuan Fault, Salt Lake pull-apart basin, cross-basin fault, paleoearthquake, cascade rupture

摘要：

沿大型走滑断裂带经常发生导致多个断层段同时破裂的级联破裂地震事件。海原断裂带在1920年海原M 8¹/₂地震时3个段同时发生破裂，干盐池拉分盆地即为其西段和中段的分段边界。沿该盆地内新生断层的古地震研究揭示了晚更新世末期以来的至少7次古地震事件证据，最新1次事件为1920年海原地震，1920年海原地震之前的1次事件可能与1092年历史地震对应。对比分析表明，这些事件可能均为超过8级的大地震，其复发呈现地震丛集与单个事件相间排列的规律，当前可能处于最近的1个地震丛集期内。该古地震序列与整个海原断裂带的大地震活动历史的对比表明，干盐池拉分盆地内新生断层在级联破裂地震事件发生时并非总是同时破裂，该断层是否参与破裂可能与该次级联破裂事件的震级大小有关。讨论整个走滑断裂带大地震活动历史时应避免仅依据具有一定规模的拉分盆地内部断层的破裂记录。

关键词: 海原断裂带, 干盐池拉分盆地, 盆内新生断层, 古地震, 级联破裂

CLC Number:

P315.2

LI Yan-bao, RAN Yong-kang, WANG Hu, WU Fu-yao. PALEOSEISMIC RECORDS OF LARGE EARTHQUAKES ON THE CROSS-BASIN FAULT IN THE SALT LAKE PULL-APART BASIN AND CASCADE RUPTURE EVENTS ON THE HAIYUAN FAULT[J]. SEISMOLOGY AND GEOLOGY, 2016, 38(4): 830-843.

李彦宝, 冉勇康, 王虎, 吴富峣. 干盐池拉分盆地盆内新生断层大地震记录与海原断裂带级联破裂地震事件[J]. 地震地质, 2016, 38(4): 830-843.

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