In order to build an earthquake observation system that everyone can use, we construct a sensor network system by utilizing a cloud system. The sensor network system can archive seismic response information on tens of thousands of residential buildings. In this system, once a sensor is settled and communication is established, sensor information and earthquake records will be uploaded automatically on cloud. Then, public can see sensor information and observed waveforms, as well as download

more »

... forms through the Internet. On the other hand, the house owner does not have to construct and maintain a data server. We installed dozens system for ordinary homes in Fujisawa and Nagaoka cities, and conducted a proof experiment. In this paper, we compare records observed by professional seismographs and the MEMS accelerometers built in the small mobile hand-held device.