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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/5947
Title: Advances in understanding of the mechanism for generation of earthquake thermal precursors detected by satellites
Authors: Saraf, Arun Kumar
Rawat V.
Choudhury S.
Dasgupta S.
Das, Josodhir D.
Published in: International Journal of Applied Earth Observation and Geoinformation
Abstract: Stresses building up during an earthquake preparation phase also manifest themselves in the form of a so called increased land surface temperature (LST) leading to a thermal precursor prior to the earthquake event. This phenomenon has now been validated by our observations of short-term thermal anomalies detected by infrared satellite sensors for several recent past earthquakes around the world. The rise in infrared radiance temperature was seen to vary between 5 and 12 °C for different earthquakes. We discuss in this paper different explanations for the generation of such anomalies that have been offered. Emission of gases due to the opening and closure of micropores upon induced stresses and also the participation of ground water have been propounded as a possible cause for generation of thermal anomalies. Seismo-ionosphere coupling, by which gases like radon move to the earth-atmosphere interface and cause air ionization thus bringing about a change in air temperature, relative humidity, etc., has been put forth by some workers. A mechanism of low frequency electromagnetic emission was tested and experimented by scientists with rock masses in stressed conditions as those that exist at tectonic locations. The workers proposed the positive hole pair theory, which received support from several scientific groups. Positive holes (sites of electron deficiency) are activated in stressed rocks from pre-existing yet dormant positive hole pairs (PHPs) and their recombination at rock-air interface leads to a LST rise. A combination of remote sensing detection of rock mechanics behavior with a perception of chemistry and geophysics has been applied to propose the remote sensing rock mechanics theory. Remote sensing detections of such anomalies confirm so far proposed lab theories for such a hotly debated field as earthquake precursor study by providing unbiased observations with consistency in time and space distribution. © 2009 Elsevier B.V. All rights reserved.
Citation: International Journal of Applied Earth Observation and Geoinformation (2009), 11(6): 373-379
URI: https://doi.org/10.1016/j.jag.2009.07.003
http://repository.iitr.ac.in/handle/123456789/5947
Issue Date: 2009
Keywords: Earthquake
Land surface temperature
Positive hole theory
Thermal infrared anomaly
ISSN: 15698432
Author Scopus IDs: 7006460159
23467947400
57198392507
23466210100
7202105464
Author Affiliations: Saraf, A.K., Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Rawat, V., Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Choudhury, S., Wadia Institute of Himalayan Geology, Dehradun, India
Dasgupta, S., Reliance Industries Limited, Navi Mumbai, India
Das, J., Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Corresponding Author: Saraf, A.K.; Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee, 247667, India; email: saraffes@iitr.ernet.in
Appears in Collections:Journal Publications [EQ]
Journal Publications [ES]

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