The main goal of this project was microzonation techniques’ transfer by training the faculty and graduate students of Tribhuvan University, Nepal to perform data acquisition, analysis, and computation of seismic site response by using ambient noise measurement for seismic microzonation. The PI also conducted a pilot research project on seismic microzonation study to support reconstruction activities in the Kathmandu valley, which was the site of 2015 Gorkha earthquake (Mw 7.8). This event, which hit central Nepal, killed approximately 9,000 people and destroyed 1 million houses. It also caused an economic loss of 7 Billion USD, equivalent to one-third of the country’s gross domestic product.
The team conducted the geological mapping of the valley by using microtremor measurement using McSIES-MT NEO (3 components) with velocity sensor of servo having frequency range of 0.1 to 70 Hz, and data acquisition instruments with 32 bits A/D converter. They also used Spatial Auto Correlation (SPAC) method for data analysis using Geopsy code and collected borehole data and conducted interpretation with presentation of results in the form of map using Geographic Information System.
The trained graduate students contributed to the field of engineering seismology and earthquake geotechnical field for earthquake resilient construction in the country. The basement topography, Vs30, and fundamental period maps were key to risk sensitive urban development. The results were useful for reconstruction movements starting right after the devastating earthquake. The database produced through this research has become key information for seismic hazards assessment in Kathmandu valley. This pilot project paved the path to serve as an example for other basins of the Himalayas.
Partnering Organizations
Thammasat University, Thailand; Department of Geology, Tri-Chandra M. Campus and Institute of Engineering, Pulchowk Campus, Tribhuvan University and SEG Student Chapter at Tribhuvan University.
UNSDGS Addressed
SDG4: Quality Education, SDG 11 Sustainable Cities and Communities and SDG 17 Partnership for Goals
