Abstract
Computing displacement from measured acceleration is important for understanding the characteristics of an earthquake. However, to obtain such displacement with a good accuracy is difficult. It is partly because the low-frequency component dominating the behavior of the displacement is often affected by the sensor's tilt and the measurement error. In this paper, a new methodology to get the acceleration without those undesirable effects is proposed. In addition, the integration method in frequency domain for computing displacement from the obtained acceleration is proposed, considering causality as a constraint to avoid the numerical error. Using these techniques, the estimation of residual displacement of the 2008 Iwate-Miyagi Nairiku Earthquake is attempted.
