Surface latent heat flux anomalies before the M_S 7.1 New Zealand earthquake 2010  

作　　者：QIN Kai WU LiXin DE SANTIS Angelo WANG He 

机构地区：[1]College of Geosciences and Surveying Engineering, China University of Mining and Technology （Beijing）, Beijing 100083, China [2]Key Laboratory of Environment Change and Natural Disaster （Ministry of Education）, Beijing Normal University, Beijing 100875, China [3]Istituto Nazionale di Geofisica e Vulcanologia, Rome 00143, Italy

出　　处：《Chinese Science Bulletin》2011年第31期3273-3280,共8页

基　　金：supported by the National Basic Research Program of China (2011CB707102);the Fundamental Research Funds for the Central Universities (2010YD01);the Program of Scientific and Technological Cooperation Between Italy and China (SAGA-4-EPR)

摘　　要：By analyzing surface latent heat flux (SLHF) data from the NCEP/NCAR Reanalysis Project for the period three months before and after the Sept. 3, 2010 M S 7.1 New Zealand earthquake, an isolated SLHF positive anomaly on Aug. 1, 2010 was found with a high value of about 160 W/m 2 to the northeast of the epicenter. Historical data, background pixels, and wavelet transforms of time series were comprehensively analyzed to study the spatiotemporal features of the SLHF anomaly. After removing the influences of wind speed and cloud cover, the key factor leading to local SLHF anomalies is the surface temperature increment. Combined with GPS displacement observations and tectonic settings, we determined that the physical mechanism of the SLHF anomaly could possibly be attributed to hot underground materials related to high-temperature and high-pressure upwelling from the deep crust and mantle along the nearby subduction zone, thereby explaining the local temperature increment to the northeast of the epicenter, as well as in the center of the North Island and the southwest of the South Island. Furthermore, it changed the specific humidity between the ground and surface air, causing the local SLHF increment.By analyzing surface latent heat flux （SLHF） data from the NCEP/NCAR Reanalysis Project for the period three months before and after the Sept. 3, 2010 Ms 7.1 New Zealand earthquake, an isolated SLHF positive anomaly on Aug. 1, 2010 was found with a high value of about 160 W/m2 to the northeast of the epicenter. Historical data, background pixels, and wavelet transforms of time series were comprehensively analyzed to study the spatiotemporal features of the SLHF anomaly. After removing the influences of wind speed and cloud cover, the key factor leading to local SLHF anomalies is the surface temperature increment. Combined with GPS displacement observations and tectonic settings, we determined that the physical mechanism of the SLHF anomaly could possibly be attributed to hot underground materials related to high-temperature and high-pressure upwelling from the deep crust and mantle along the nearby subduction zone, thereby explaining the local temperature increment to the northeast of the epicenter, as well as in the center of the North Island and the southwest of the South Island. Furthermore, it changed the specific humidity between the ground and surface air, causing the local SLHF increment.

关 键 词：潜热通量 新西兰 异常 地表 地震 大地构造背景 温度升高 NCEP 

分 类 号：P315[天文地球—地震学]