COMPARISON OF SEISMIC, GEOLOGIC AND GEODETIC MOMENT RATES IN CENTRAL ALBORZ

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ASADI SARSHAR M.; BAHROUDI A.; GHORASHI M.; GHASEMI M.R.

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Journal: GEOSCIENCES Year:2010 | Volume:19 | Issue:75 Page(s): 19-24

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Title

COMPARISON OF SEISMIC, GEOLOGIC AND GEODETIC MOMENT RATES IN CENTRAL ALBORZ

Author(s)

ASADI SARSHAR M. | BAHROUDI A. | GHORASHI M. | GHASEMI M.R. | Issue Writer Certificate

Keywords

MOMENT RATEQ2

CENTRAL ALBORZQ2

ENERGYQ2

EARTHQUAKEQ2

STRAIN RATEQ2

Abstract

Estimate of MOMENT RATE is comparatively reckoned as a new method for dealing with tectonic activities rate in different regions and it prepares the way for putting together different methods. In fact, MOMENT RATE states rate of ENERGY which exists in deformation system. There are three different approaches to state MOMENT RATE that each one express tectonic motion and movement of a region from a particular view. These three approaches consist of: geodetic (surveying), seismic and geology methods. Geodetic method which is determined on the basis of gained STRAIN RATE tensor from geodetic data, shows deformation rate) including seismic and aseismic) that is happening in the region at this moment in time. MOMENT RATE which has gained on the basis of historical and instrumental catalogues, shows the total released seismic ENERGY during quake events which are available in EARTHQUAKE of region and geologic MOMENT RATE which gained with geometric parameters of faults, reveals potential of the faults in releasing stored elastic ENERGY in. Geodetic MOMENT RATE, seismic MOMENT RATE (on the basis of historical and instrumental EARTHQUAKE data) and geologic MOMENT RATE are estimated for CENTRAL ALBORZ region. The most MOMENT RATE in the study area belongs to geodetic approach (8.83x1019 Nm/yr) and then geologic MOMENT RATE (0.12x1019 Nm/yr) and finally the least quantity belongs to seismic MOMENT RATE 0.022x1019- 0.046x1019 Nm/yr). Considering, distribution of EARTHQUAKE epicenters, the most seismic ENERGY is released in the south parts of CENTRAL ALBORZ and considering high geodetic and geologic MOMENT RATEs in north parts, it seems, north parts of CENTRAL ALBORZ have higher seismic potential.

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