Earthquake History Seismicity and Tectonics of the Regions of Afghanistan

摘要

A detailed and documented research into the earthquake history of the regions of Afghanistan has been made. The investigation is concerned with both non-instrumental intensity reports and recorded instrumental data. The history is presented by a chronological catalogue of nearly 500 earthquake intensity reports spanning the past 2,000 years, and also by chronological listings of nearly 2,000 recorded earthquake events during the past 70 plus, years. Where possible, correlation between the instrumental and non-instrumental data is given. Based on the instrumental history, seismicity maps for the broad region, defined by 27 to 40DGN and 58O to 76OE, for the time period 1893 to 1969, have been drawn and are presented, A detailed seismicity analysis of the northeastern sector of tHe broad region has been undertaken,and by a series of depth-restricted seismicity maps, the well-known source of intermediate-depth Hindu Kush earthquakes is revealed with exceptional clarity. Also, based on the non-instrumental data, an intensity zone map has been constructed and is presented. Appropriate information on the latest concepts of global and continental tectonics is included for the purpose of acquiring a better insight into the regional teckonic mechanism. Maps of the regional fault systems are presented and a number of postulations are submitted in an attempt to relate the observed regional tectonic patterns to the global and continental systems. Some information on the geology and geography of the country is also presented. A seismo-tectonic analysis has been made and the first seismotec. tonic map for Afghanistan is included with the report. By the synthesis of all the information presented in the report, a preliminary seismic risk map for Afghanistan has been drawn. The format adopted is such that the map will provide the basis for the future establishment and adoption of earthquake-resistant building codes tailored to the needs of Afghanistan.