EQMonitor - 地震速報 is a weather app by Ryotaro Onoue (YumNumm) with 10,000+ downloads (about 19K estimated). +322 installs in the last 7 days. Released Dec 1, 2023. Install growth, rank history, SDKs and ad networks.
From the store listing: “EQMonitor is an application that allows you to quickly receive earthquake information from all over Japan.
Please note that this application is being developed independently of the Japan Meteorological Agency, the National Research Institute for Earth Science and Disaster Prevention, and other government agencies.…”