APPLICATION OF MULTICHANNEL ANALYSIS OF SURFACE WAVES (MASW) FOR SEISMIC HAZARD ASSESSMENT: A CASE STUDY IN THE CHONG-ALAY DISTRICT, KYRGYZ REPUBLIC

The measurement of shear wave velocity (Vs) is an established approach in contributing to earthquake site response. In situ dispersive wave measurements are one of the ways of determining Vs to a certain depth. Rayleigh type measurements have had a significant development in the past two decades. Since Spectral Analysis of Surface Waves measurements appeared, in the late 80s and early 90s, other approaches have developed. The later Multichannel Analysis of Surface Waves method (MASW), that took advantage of the engineering seismograph and the increasing number software routines that became available, greatly enhanced the confidence of this type of in situ results towards assessing the shear wave velocity profile of the near surface. Thus within this work we aim to show the results of 27 dispersive wave tests, made for 48 educational facilities located in 20 villages of the Chong-Alay district, Osh oblast, Kyrgyz Republic. The results of these seismic tests contributed towards the micro seismic wider hazard assessment study we performed.