Temporal change of near-surface shear wave velocity associated with rainfall in Northeast Honshu, Japan
Abstract
We apply seismic interferometry to earthquake records to investigate temporal change of near-surface shear wave velocity associated with rainfall in Northeast Honshu, Japan. We observe there exists a threshold (around 100 mm of 24 h rainfall total) of the temporal influence of rainfall on near-surface shear wave velocity. The velocity does not change significantly under low-intensity rainfall, while it is reduced by 1-3% with one exception of 10% when the rainfall intensity exceeds the threshold. Compared with the travel time of no rain, the travel time increment of low-intensity rainfall is no more than 3 × 10-4 s, while that of high-intensity rainfall ranges between 10-3 and 10-2 s. Based on the results of observation, we propose a one-dimensional model to compute the travel time increment, which can give a preliminary estimation of the temporal influence of rainfall on near-surface shear wave velocity.
- Publication:
-
Earth, Planets and Space
- Pub Date:
- December 2018
- DOI:
- 10.1186/s40623-018-0969-3
- Bibcode:
- 2018EP&S...70..204M
- Keywords:
-
- Earthquake ground motions;
- Seismic interferometry;
- KiK-net;
- Rainfall