scholarly journals Diurnal variations of outgoing long wave radiation (OLR) vis a vis 4 January, 2016 Manipur earthquake (Mw: 6.7): An earthquake precursor?

MAUSAM ◽  
2021 ◽  
Vol 68 (3) ◽  
pp. 475-486
Author(s):  
RAJESH PRAKASH ◽  
H. N. SRIVASTAVA
Keyword(s):  
Seismic Activity ◽  
Earthquake Precursor ◽  
Diurnal Variations ◽  
Wave Radiation ◽  
Outgoing Long Wave Radiation ◽  
Temperature Changes ◽  
Long Wave ◽  
Surface Temperatures ◽  
Epicentral Region ◽  
Long Wave Radiation

Daily and diurnal variations of OLR from INSAT 3D and Kalpana satellites have been studied during 25 December, 2015 to 5 January, 2016 over the epicentral region of the Manipur earthquake of 4 January, 2016 (Mw 6.7) and other regions within the view of these satellites. The surface temperatures recorded at Imphal around 30 km from epicentre of this earthquake were also examined. It is found that OLR remained low prior to the occurrence of Manipur earthquake while much larger rise occurred over several other regions where no significant seismic activity was reported. The results corroborate inferences reported in earlier studies that OLR or temperature changes are related to meteorological causes and its sole identification as earthquake precursor may be misleading due to poor constraints.

Surveillance of Vrancea active seismic region in Romania through time series satellite data

2014 ◽  
Vol 6 (2) ◽  
Author(s):  
Maria Zoran ◽  
Roxana Savastru ◽  
Dan Savastru
Keyword(s):  
Time Series ◽  
Satellite Data ◽  
Land Surface ◽  
Main Shock ◽  
Tectonic Activity ◽  
Wave Radiation ◽  
Outgoing Long Wave Radiation ◽  
Seismic Region ◽  
Long Wave ◽  
Long Wave Radiation

AbstractCumulative stress energy in active seismic regions caused by tectonic forces creates various earthquake precursors. This energy transformation may result in enhanced transient thermal infrared (TIR) emission, which can be detected through satellites equipped with thermal sensors like MODIS (Terra/Aqua) and AVHRR (NOAA). Satellite time-series data, coupled with ground based observations, where available, can enable scientists to survey pre-earthquake signals in the areas of strong tectonic activity. This paper presents observations made using time series MODIS and NOAA-AVHRR satellite data for derived multi-parameters including land surface temperature (LST), outgoing long-wave radiation (OLR), and mean air temperature (AT) for the moderate, 5.9 magnitude earthquake, which took place on the 27th of October, 2004, inthe seismic region of Vrancea, in Romania. Anomalous thermal infrared signals, reflected by a rise of several degrees celsius (°C) in LSTs, and higher OLR values were seen several days before the earthquake. AT values in the epicentral area also increased almost two days prior to the earthquake and intensified three days after the main shock. Increases in LSTs and OLR disappeared three days after the main shock. The survey and joint analysis of geospatial and in-situ geophysical information on land surface temperatures and outgoing long-wave radiation provides new insights into the field of seismic hazard assessment in Vrancea, a significant area of tectonic activity in Romania and Europe.

Outgoing Long-wave Radiation from Indian Stations

Nature ◽  
1965 ◽  
Vol 207 (4999) ◽  
pp. 852-853 ◽  
Author(s):  
M. G. GUPTA
Keyword(s):  
Wave Radiation ◽  
Outgoing Long Wave Radiation ◽  
Long Wave ◽  
Long Wave Radiation
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