Thermal Infrared Anomalies identification as a Precursor Earthquake in Iran
عنوان دوره: هجدهمین کنفرانس ژئوفیزیک ایران
نویسندگان
چکیده
In this study, time series of satellite (TIR) imaging are used and pre- processed prior to major earthquakes with Mw >6 occurred in Iran including: Varzaghan, Mw 6.2 ,2012/08/11; Saravan Mw 7.5 , 2013/04/16 earthquakes. These earthquakes are known to associate with fault systems. The corresponding data including time series of NDVI and Brightness Temperature (BT) of the bands (BT31, BT32) were derived from MODIS images and the Qin Algorithm was then applied to calculate the LST.The results confirm the existence of an anomaly in LST data before these events for Saravan and Varzaghan earthquakes. The short-lived anomalies have been reported to appear normally 2-4 days before an earthquake and can affect an area of several thousand square km. Our results show positive deviation of >5 °C and to disappear a few days after the main event. The time scale of the observed variations is a one week before the onset of the seismic event.
کلیدواژه ها
 
Title
Thermal Infrared Anomalies identification as a Precursor Earthquake in Iran
Authors
Abstract
In this study, time series of satellite (TIR) imaging are used and pre- processed prior to major earthquakes with Mw >6 occurred in Iran including: Varzaghan, Mw 6.2 ,2012/08/11; Saravan Mw 7.5 , 2013/04/16 earthquakes. These earthquakes are known to associate with fault systems. The corresponding data including time series of NDVI and Brightness Temperature (BT) of the bands (BT31, BT32) were derived from MODIS images and the Qin Algorithm was then applied to calculate the LST.The results confirm the existence of an anomaly in LST data before these events for Saravan and Varzaghan earthquakes. The short-lived anomalies have been reported to appear normally 2-4 days before an earthquake and can affect an area of several thousand square km. Our results show positive deviation of >5 °C and to disappear a few days after the main event. The time scale of the observed variations is a one week before the onset of the seismic event.
Keywords
Thermal Anomalies, Satellite Image, Earthquake, Precursor