Abstract
In this paper, we propose an epicenter measurement using a laser interferometer. The laser interferometer system is an equipment with its extraordinary accurate capability for displacement measurement. The seismic signal is measured in the observation as P-wave and S-wave form. The seismic signal is indicated as in a form of intensity signal which is represented as a trigonometrical function using the heterodyne laser interferomter. The epicenter can be derived by P-S time which can be determined by intensity signal. With a range difference of arrival (RDOA) method, we can estimate the epicenter location from the distance data between the epicenter and the observatory. We suggest a recursive least square (RLS) algorithm to obtain a solution that minimizes estimation error value. Through some simulations, we prove the performance of the proposed method.
Highlights
The damage from the earthquake has been increasing around the world
We demonstrate the measurement of a seismic signal by using a laser interferometer and measure the P-S time using the intensity signal
We measure the distance from the epicenter to the observatory and determine epicenter location
Summary
The damage from the earthquake has been increasing around the world. Analyses of earthquakes have been extended to diverse parts such as distance of epicenter, magnitude, frequency measurement and intensity analysis. If the measured seismic signal is more accurate, it is possible to reduce the damage of the earthquake. Amin [1] proposed a method for early detection of earthquakes using the notion of quantum computing. We propose an accuracy epicenter measurement solution with a heterodyne laser interferometer that determines epicenter location. The heterodyne laser interferometer measures a seismic wave more accurately than seismometers such as accelerometers and velocimeters. Using the heterodyne laser interferometer, the seismic signals are indicated as in a form of intensity signal which is represented as a trigonometrical function.
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