Photographs taken during Linlin Ge's visit to the Meteorological Research Institute (MRI), Japan, to undertake UNSW-MRI "GPS seismometer" experiments.

9 - 10 August 1999

Objectives: to test a 20Hz GPS-RTK system side by side with a broadband seismometer on an earthquake simulating truck, and to compare the results of the simulated earthquakes.

Experimental setup: a GPS antenna and a broadband seismometer are mounted on the roof of an earthquake simulating truck, on a river bank in Tokyo, Japan. A GPS reference station is setup at the side of the truck. The GPS system is configured to record at 5, 10 and 20Hz sampling rates in three sessions. The instruments used were Trimble MS750 GPS receivers (kindly loaned by Trimble Inc.) and the MRI's broadband seismometer

Analysis: spectral analysis and adaptive filtering of the GPS-RTK series according to the methodology described in the paper "GPS seismometer and its signal extraction", presented at the 12th International Technical Meeting of the Satellite Division of the U.S. Institute of Navigation, ION'99, 15-17 September 199, Nashville, Tennessee. The results will be reported at the Int. Symp. on GPS: Application to Earth Sciences & Interaction with Other Space Geodetic Techniques, in Tsukuba,18-22 October 1999.

A shaker table was setup, with a GPS receiver and seismometer side-by-side to record the vibrational signals.