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Seismograph Comparison StudySeismograph Comparison Study

Project: Supergraph II Comparison Study at the BART Transbay Tub During Underwater Pier Blasting for Caltrans
Date: January 29, 2016


This report summarizes a side-by-side study of three different seismograph systems used to record vibrations measured on a subway tunnel wall during this underwater blast of a bridge pier. Monitoring of background train and the blast vibrations in the BART Transbay tube between San Francisco and Oakland California, took place on November 14, 2015. The Transbay tube is a reinforced concrete submerged tunnel under the San Francisco Bay that is buried in engineered fill within the Bay mud. The tube carries BART commuter trains on two tracks oriented eastbound and westbound.

For the full report, click here.