基于潮汐附加构造应力的2013年灯塔M_(S)5.1地震射出长波辐射变化分析  

Analysis of Outgoing Longwave Radiation Changes before and after the 2013 Dengta M_(S)5.1 Earthquake Based on Tidal Additional Tectonic Stress

作　　者：荆涛 Boonphor Phetphouthongdy Chansouk Sioudom 刘洋洋 李继庚 康春丽[3] 马未宇[3] JING Tao;Boonphor Phetphouthongdy;Chansouk Sioudom;LIU Yang-yang;LI Ji-geng;KANG Chun-li;MA Wei-yu(Shenyang Earthquake Monitoring Center Station,Shenyang 110061,China;Department of Meteorology and Hydrology,Ministry of Natural Resources and Environment,Vientiane 15011,Lao PDR;China Earthquake Networks Center,Beijing 100045,China)

机构地区：[1]沈阳地震监测中心站,辽宁沈阳110061 [2]Department of Meteorology and Hydrology,Ministry of Natural Resources and Environment,Vientiane 15011,Lao PDR [3]中国地震台网中心,北京100045

出　　处：《地震》2024年第2期52-62,共11页Earthquake

基　　金：地震数值预测联合实验室开放基金项目(2020LNEF03);APSCO Earthquake Research Project PhaseⅡ:Integrating Satellite and Ground Observations for Earthquake Signatures and Precursors(WX0519502)。

摘　　要：针对2013年1月23日辽宁灯塔M_(S)5.1地震,利用引潮力附加构造应力(Additional Tectonic Stress Caused By Tidal Force,ATSCTF)计算模型,计算得到震中位置(41.5°N,123.2°E)在地震前5周以及震后3周(2012年12月16日—2013年2月15日)的ATSCTF变化。地震发生时,ATSCTF垂直方向分量处于高相位点附近,显示引潮力对本次正断层走滑型地震具有诱发作用。以ATSCTF变化周期的各低相位点时间(2012年12月19日、2013年1月4日、2013年1月18日、2013年2月2日)数据分别为背景,各周期期后数据分别与背景逐日相减,计算研究区(36°N~46°N,118°E~128°E)范围内,National Oceanic and Atmospheric Administration(NOAA)卫星射出长波辐射数据(Outgoing Long Wave Radiation,OLR)在各ATSCTF周期时段分布及其变化。结果显示,无震的ATSCTF变化的A、B、D周期,震中附近OLR无变化;发震的ATSCTF变化的C周期,在空间上,该地区震前OLR仅震中及其南侧区域发生了显著连续升高变化过程,在时间上经历了初始微异常→异常加强→高峰→衰减→发震→平静的演化过程,与岩石应力加载—破裂经历:初始微动破裂→扩张破裂→应力闭锁→地震爆发→平静的力学演化过程中各阶段红外辐射特征一致;显示引潮力对处于临界状态的活动断层具有诱发作用,而OLR是地震构造应力应变过程辐射表征。According to the M_(S)5.1 earthquake in Dengta, Liaoning Province on January 23, 2013, the variation of ATSCTF(Additional Tectonic Stress Caused by Tidal Force) at the epicenter(41.5°N, 123.2°E) was calculated for 5 weeks before the earthquake and 3 weeks after the earthquake(from December 16, 2012 to February 15, 2013) using the ATSCTF calculation model. When the earthquake occurred, the vertical component of ATSCTF was near the high phase point, indicating that tidal force had an inducing effect on the normal fault strike-slip earthquake. The low phase points of the ATSCTF cycle(December 19, January 4, January 18, February 2) were taken as the background, and the subsequent data of each cycle were subtracted from the background day by day. The variation of ATSCTF of the seismogenic period is C cycle. In space, the OLR of the epicenter and its southern area shows a significant continuous increase before the earthquake, and in time, it experiences an evolution process of initial micro-anomaly→anomaly strengthening→peak→attenuation→earthquake→quiet, which is consistent with the infrared radiation characteristics of the mechanical evolution process of rock stress loading-rupture: initial fretting rupture→expansion rupture→stress locking→earthquake outbreak→quiet. It shows that the tidal force has an inducing effect on the active fault in a critical state, and OLR is the radiation characterization of the seismic tectonic stress and strain process.

关 键 词：2013年灯塔M_(S)5.1地震 长波辐射 潮汐附加构造应力 震前ATSCTF周期异常 

分 类 号：P315.7[天文地球—地震学]