摘要：Abstract
Thermal anomalies which are known to be significant
precursors of strong earthquakes can be evidenced
by spectral thermal infrared (TIR) bands recorded
by sensors on board of NOAA-AVHRR and Terra/Aqua-
MODIS satellite. In order to locate relevant thermal anomalous
variations prior to some strong even moderate earthquakes
recorded in Vrancea tectonic active zone in Romania,
satellite derived geophysical parameters have been
used: land surface temperature (LST), outgoing long-wave
radiation (OLR) and mean air temperature (AT). Spatiotemporal
variations of LST, OLR, and AT before and after
three strong earthquakes in Vrancea area (Mw = 7.4, 4
March 1977; Mw = 7.1, 30 August 1986; Mw = 6.9, 30 May
1990) and a moderate earthquake (Mw = 5.9, 27 October
2004) have been analyzed. Anomalous spatio-temporal
patterns of these parameters developed a few days up to
few weeks before the earthquakes disappeared after the
main shocks. Significant increases in land surface temperature,
outgoing long-wave radiation, and mean air temperature
can be assigned to energy exchange mechanism
during earthquake preparatory events. Such preseismic
anomalies can be considered to be associated with the
thermodynamic, degassing and ionization geochemical
processes which seem to be activated due to the increased
stress in the ground, and microfracturing of the rocks especially
along area’s active faults.
关键词：KeywordsThermal seismic precursors NOAA-AVHRR and
MODIS data geophysical parameters anomalies Vrancea
seismic zone Romania
