Abstract:
Geographically Pakistan is one of the most earthquake prone area in Asia. The
southern side of Pakistan has been hit by some large events e.g. Awaran, Dalbandin and
Gawadar. Study area of this project covers major selected earthquakes above magnitude
Mw. 6.
For earthquake research the recent development is the application of Outgoing
Long-wave radiation (OLR). The current researches are now interested in the preearthquake distortion detection. OLR anomaly is used to detect pre-earthquake signals.
The possible explanation for the cause of such anomalies is the existence of thermal
outgoing radiation. This phenomenon is hypothesized to be the part of relationship
between tectonic stresses and thermodynamic processes in the atmosphere. The
prompting progression may be due to the discharge of gases such as radon from
lithosphere at the region of faulting. This in turn rises the air ionization, leads to changes
in the conductivity of air and a latent heat release due to condensation of ionized air. The
techniques to use the OLR estimates have been developed to detect seismic precursors
within OLR data prior to earthquakes, which is vitally important to sufficiently make use
of OLR resources to monitor stable conditions of active faults beneath the earth and to
identify the potential earthquake zones.
The approach is based on monitoring the Outgoing long-wave radiation (OLR) at
the top of atmosphere, the data being acquired by Geo stationary Satellites and provided
by National Oceanic and Atmospheric Administration NOAA.
The results shows inspiring signs and anticipating of earthquakes. The Ziarat
earthquake shows highest value of 35 w/m2 on 2nd of August at 2°x2° and 19 w/m2 at
4°x4°on same day. The Awaran earthquake show highest value of OLR anomaly of 69
w/m2 on 3rd August at 2°x2° and 51 w/m2 at 4°x4°on same day. The Pasni earthquake
show highest value of OLR anomaly of 52 w/m2 on 24th January at 2°x2° and 32 w/m2 at
4°x4°on same day. The research indicates that the OLR anomalies are high near to the
epicenter for an event i.e. at 2°x2°.
