Abstract
<p>In the research of earthquake anomaly recognition, the coupling effect of multiple geosystem spheres can be expected to reasonably interpretating the correlation between various anomalous signals before strong earthquake. Specially, the development of the Lithosphere–Atmosphere–Ionosphere (LAI) coupling model has been accepted as verified by some experimental, thermal and electromagnetic data. However, quasi-synchronous anomalies of the multiple parameters, including thermal, radon and electromagnetic data, have not been reported in a single event case for verifying the geosystem spheres coupling effect. In this paper, we firstly summarized the reported studies on the power spectrum density (PSD) in the ELF/VLF band and radon data recorded from Guza seismic station. Then, historical surface latent heat flux (SLHF) data from the NCEP/NCAR Reanalysis Project was employed for investigating anomalous change in a month before the April 14, 2010, Ms7.1 Yushu earthquake which is one of the typical intra-continental earthquakes in Tibet Plateau. The results from spatial and temporal analysis revealed that anomalous fields of PSD and SLHF data were located close to the epicenter and the ends of some active faults at Bayan Har Block and all anomalous dates converged between April 8 and 11 (6 to 3 days before the Yushu earthquake). Therefore, we suggest that the anomalies of multiple parameters before the main shock are related with the Yushu earthquake. This paper could give an ideal case study to verify the geosystem spheres coupling effect happened in a single event.</p>
Highlights
The great earthquake anomaly has become naturally a hot topic due to its indicative information of earthquake prediction
The spot of radon monitoring at the setting of block boundary has a good ability to reflect underground gas conditions caused by tectonic activity
Our spatio-temporal analysis of surface latent heat flux (SLHF) data indicates that local SLHF increased on April 8, 9 and 13, 2010, 6-1 days before the main shock
Summary
The great earthquake anomaly has become naturally a hot topic due to its indicative information of earthquake prediction. The geo-spheres coupling effect makes the multiple parameters earthquake anomaly a universal significance and general acceptance in scientific community. Few papers have verified the coupling effect by a single earthquake case with quasi-synchronous anomalies of multi-parameters (the gas radon, thermal and electromagnetic data especially) in different spheres so far. Combining with the alternative anomalous time of multiple parameters, we confirm the anomalies of multiple parameters related to the Yushu earthquake based on the spatial geo-consistency and temporal quasi-synchronism [Wu et al 2006a, 2012, Qin et al 2012] and try to give a comprehensive case study with the anomalous variations for verifying geosystem spheres coupling effect
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