iJishin

iJishin

by Hakusan Corporation

1 ratings
2 reviews
Free

Details

  • Released
  • Updated
  • August 20, 2010
  • July 17, 2026

Features

iJishin screenshot #1 for iPhone
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iJishin screenshot #8 for iPhone
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About

This application transforms your iPhone into a seismometer, allowing you to measure and analyze seismic vibrations. You can upload your observations to share with the public and utilize various tools for wave analysis, including graphical displays of power spectrum and displacement.

Transforms iPhone into a seismometer
Measures seismic vibrations
Analyzes wave data
Uploads seismic observations
Graphical display of power spectrum
Measures velocity and displacement
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What's New in iJishin

6.0.0

July 17, 2026

iJishin – iPhone/iPad seismometer, measure and analyze anytime, anywhere. iJishin is a free app that turns your iPhone or iPad into a seismometer, data browser, and vibration analyzer. FEATURES: • Real-time measurement: Uses the device's accelerometer to measure earthquake vibrations sampled at 100Hz with precise UTC timestamps via NTP synchronization. • Automatic recording: Starts/stops recording when acceleration exceeds/falls below the configurable trigger level. Pre-trigger andpost-trigger durations are adjustable. • Data analysis tools: - Waveform display (acceleration) - FFT power spectrum - Velocity and displacement (integration) - 2D orbit trajectory - Seismic intensity (JMA scale) calculation • Pinch to zoom, pan to scroll, and tap for details on all graphs. • Cloud upload: Automatically upload measurement data to iCloud Drive or external cloud storage. • Multi-language support: English, Japanese, Spanish, and Chinese (Simplified). Feel the vibration and measure with iJishin! Please note: The function for uploading data to geonavi.com or users’ own FTP servers has been suspended. The measurement function synchronised with Japan’s Earthquake Early Warning system has also been suspended. Furthermore, the seismic intensity map has been removed. All these measures have been taken to safeguard privacy and security.

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User reviews

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Add this feature please

This is a nice app but what it really needs is the ability to utilize the iPhone accelerometer to detect earthquakes and automatically share that data to the cloud and/or the USGS.

Only when enough similar readings are detected from a certain region within a narrow timeframe would the data be considered legitimate and then be pushed back out to the map for all users to view.

The app could also be active only at certain times of the day/night that the user defines. As well as only be active when connected to pre-defined wifi networks. Such as Home or work.

Another option would be to only take accelerometer reading when it is plugged into power (such as when on your night stand or connected to a computer USB).

The app could also use the iPhone GPS to disable sensor reading when moving. As well as only record seismic data when the app detects the iPhone is laying flat on its back.

Another option would be to disable the seismic sensor data output when a face is detected with the front facing camera.

Requiring the app to be running in the foreground would also further prevent false readings.

This could easily, quickly, and cheaply create a huge network of seismographs around the world.
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Developer apps

FAQ

How does iJishin measure earthquakes?

iJishin utilizes the iPhone's built-in acceleration sensors to detect and measure earthquake vibrations. The signals from three sensors are sampled at 100Hz and precisely time-stamped using an external NTP server for accuracy.

What kind of data can iJishin provide?

iJishin records seismic information such as maximum acceleration, 'SHINDO' (seismic intensity), and occurrence time. It also offers tools for analyzing wave data, including graphical displays of power spectrum, velocity, displacement, and 2D device trajectory.

Can I share my earthquake observations with iJishin?

Yes, iJishin allows you to upload your seismic information, such as maximum acceleration and seismic intensity, to make your observations public. This contributes to a shared database of seismic events.

What devices does iJishin support?

iJishin is compatible with iPhone, iPad, and iPod touch devices, transforming them into seismometers and data browsers.

How often is iJishin updated?

The latest version of iJishin is 5.1.3, which was last updated on August 24, 2018. While the app is functional, users should note the last update date.

What is the age rating for iJishin?

iJishin has an age rating of 4+, making it suitable for a wide range of users interested in seismic activity.

Does iJishin have ads?

No, iJishin does not contain advertisements. It is a free application that provides its features without interruption from ads.

What is the user sentiment for iJishin?

Based on available data, iJishin has a rating of 1.0 stars from 1 rating. This indicates a very low user satisfaction score, and potential users should consider this feedback.