Abstract
Crustal deformation data, such as volumetric strainmeter records, are often affected by rain. The correction by the precipitation data is effective about such data, and the quality of the precipitation data is important. Because many crustal deformation measurement sites do not include a local rain gauge, it is necessary to consider what kind of precipitation data should be brought to bear in such cases.
Japan Meteorological Agency (JMA) observes precipitation data by the rain gauge in the volumetric strainmeter. In addition, JMA observes precipitation data by the rain gauge network of the Automated Meteorological Data Acquisition System (AMeDAS) consisting of station about 17km apart. And JMA makes the radar-raingauge analyzed precipitation data that combined the observation of the rain gauge with a radar. This paper reports on a comparison of corrections made by using these three precipitation data. Our results, confirm the importance of installing a rain gauge at strainmeter stations, and the effectiveness of the radar-raingauge analyzed precipitation. This result is important to the correction by the precipitation data of crustal deformation data from sites without a rain gauge.
