Seismotectonics of Andaman-Sumatra Region: Seismic Quiescence and B Value as Possible Precursors

Objectives: a) To analyze the long-term seismicity and understand potential of seismic quiescence study to use it as a reliable precursor b) estimate B value variation in earthquake seismically active region. Methods: The present analyses pattern from Andaman- Sumatra region for period 1964 2018. area has been divided into epicentral blocks. Earthquakes preceding succeeding major with different phases have studied carefully. All periods are characterized by high b values shocks low value. Main shock events each block (Q1, Q2 Q3) identified analyzed. Findings: suggests that there is generally approximately 6-12 years gap between earthquakes. There 28 before stature Dec 26, 2004 mega earthquake, suggesting long term leads great also proposes 20 60N latitudes shows which may lead near future. A thorough analysis can be used an precursor, though limitations. latest post after greater 2005, yield impending event 6.5 M or even greater. Novelty: deals studies one most important tectonic zone. Extensive 54 Years data done scope using prediction earthquakes examined. periodicity quantify precursors. Though various statistical attempted this zone, methodology adopted here proved methods check possible applied other areas well. Keywords: Seismicity; Andaman-Sumatra; Seismic quiescence; B-value; Precursors