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Paper Information

Journal:   REMOTE SENSING & GIS   SUMMER 2010 , Volume 2 , Number 2; Page(s) 55 To 69.
 
Paper: 

INVESTIGATION OF SPATIO- TEMPORAL PATTERNS IN IRAN’S HISTORICAL EARTHQUAKES DATA USING SPATIAL STATISTICS INDICES AND MODELS

 
 
Author(s):  HASHEMI M.*, ALIMOHAMADI SARAB A.
 
* GEODESY AND GEOMATICS FACULTY, K.N. TOOSI UNIVERSITY OF TECHNOLOGY, MIRDAMAD CROSS, VALIASR STREET, TEHRAN, IRAN
 
Abstract: 

In order to reduce and deal with the mitigation effects of earthquakes, the reliable and up-to-date information is required. In this paper, the historical earthquakes of Iran, greater than 5 Richter between years 1950 and 2010 were statistically evaluated. It was found that there is no significant trend in the earthquakes’ magnitudes along the North-South and East-West directions. Moreover, the spatial autocorrelation analyses using the distance-based indices (average distance to nearest neighbor and K (d)) revealed that the earthquakes follow the clustering pattern. However variogram, General G and Global Moran’s I indices indicated that earthquakes magnitudes are not autocorrelated. Furthermore, the statistical analyses of the maximum and mean values of the earthquakes’ magnitudes within a one-kilometer pixel illustrated an insignificant autocorrelation. The verification of the chronological behavior of the earthquakes using the cumulative histogram of them based on time and the graph of the largest earthquake’s magnitude annually, indicated that large earthquakes are continual problems. Finally, the cumulative frequency of earthquakes based on the distance to the fault revealed that 90% of the historical earthquakes have occurred within less than 40 km of faults. The obtained results can be used for investigation and extraction of earthquake prone areas, seismic zoning, verification of earthquakes trend and prediction of the future earthquakes.

 
Keyword(s): EARTHQUAKE, SPATIAL ANALYSIS, SPATIAL PATTERN, CORRELATION
 
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