CRUSTAL Qs TOMOGRAPHY IN HAINAN ISLAND AND ADJACENT REGIONS

doi:10.3969/j.issn.0253-4967.2016.03.010

Abstract

Abstract:

Using double-difference precise location results of seismic S wave data from 2000 to 2012, distribution and variation of dynamic moving average Q_s value are imaged in Hainan Island and adjacent regions through seismic attenuation tomography. We explore regional crustal S-wave attenuation characteristics of temporal and spatial variation combined with seismic activity, volcanoes and heat distribution, and GPS baseline changes. The results show that:(1)Attenuation imaging shows that there is a significant lateral heterogeneity in Q_s distribution in the study area and the Q_s values are high in the central region and low in the north and south regions of Hainan Island. Low-Q_s areas are baseically converged to the north of Wangwu-Wenjiao Fault, to the south of Jianfeng-Diaoluo Fault, and to the east of Puqian-Qinglan Fault. Earthquakes are basically converged to the edge of the transitional regions of high and low Q_s values. Heat flow sites and volcanoes zones are located in low-Q_s area in the region. (2)There is a strong correlation between dynamic moving average Q_s value, seismic activity and Luzhou-Qiongzhong GPS baseline. From 2000 to 2008, the average Q_s value of the study area is relatively high, the seismic activity is strong, and Luzhou-Qiongzhong GPS baseline is decreasing. From 2008 to 2012, the average Q_s value of the study area shows a downward trend, the seismic activity is weak, and the Luzhou-Qiongzhong GPS baseline displays an elongation trend.

Key words: Q_s tomography, seismic activity, volcanoes, heat flow, GPS baseline, Hainan Island and adjacent regions

摘要：

利用海南岛及邻区2000-2012年精定位后的地震S波资料进行Q_s值成像，得到区域Q_s值分布和滑动平均Q_s值变化，结合地震活动、火山、热流点和GPS基线变化分析区域浅层地壳（深5~15km）S波衰减的时空变化特征，并讨论了区域地壳介质应力条件状态变化的特点。结果表明：1）衰减成像结果显示研究区Q_s值空间上横向不均匀变化显著，总体呈现海南岛中部高、周边低的特征，低Q_s值（高衰减）主要分布在王五-文教断裂以北、尖峰-吊罗断裂以南及铺前-清澜断裂以东区域。地震活动多丛集分布在高、低Q_s值过渡区域，火山主要分布在王五-文教断裂以北的雷琼坳陷低Q_s值区域及其附近，大地热流点分布于低Q_s值及其边缘区域。2）滑动平均Q_s值的时间变化特征与地震活动性、泸州-琼中GPS基线变化存在较强的相关性。2000-2008年，研究区地震活动性较强，泸州-琼中GPS基线呈缩短趋势，滑动平均Q_s值相对较高，区域可能处于“高”应力介质条件状态；2008-2012年，研究区地震活动性较弱，泸州-琼中GPS基线显示伸长趋势，滑动平均Q_s值相对较低，区域可能处于应力调整、松弛的“低”应力介质条件状态。

关键词: Q_s成像, 地震活动性, 火山, 热流, GPS基线, 海南岛及邻区

CLC Number:

P315.3

WANG Hui-lin, XU Xiao-feng, ZHOU Long-quan, ZHANG Xiao-dong, SHEN Fan-lua, LI Zhi-xiong, ZHAN Wei. CRUSTAL Q_s TOMOGRAPHY IN HAINAN ISLAND AND ADJACENT REGIONS[J]. SEISMOLOGY AND GEOLOGY, 2016, 38(3): 631-645.

王惠琳, 徐晓枫, 周龙泉, 张晓东, 沈繁銮, 李志雄, 占伟. 海南岛及邻区地壳S波Q值成像特征研究[J]. 地震地质, 2016, 38(3): 631-645.

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CRUSTAL Q_s TOMOGRAPHY IN HAINAN ISLAND AND ADJACENT REGIONS

海南岛及邻区地壳S波Q值成像特征研究

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