# iJishin

> iPhone seismometer for measuring, analyzing, and sharing seismic vibration data. (iPhone/iPad app by Hakusan Corporation.)

- Source: https://appshunter.io/ios/app/ijishin/id386745649 (this page in markdown: same URL + `.md`)
- Developer: [Hakusan Corporation](https://appshunter.io/developer/386745652)
- Category: Education
- Price: Free
- Rating: 1.00/5 from 1 App Store ratings · 30 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.6 · 21 MB
- Languages: American English, Japanese, Chinese (Simplified, China), European Spanish
- Released: 2010-08-20
- Data updated: 2026-08-24
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/ijishin/id386745649/reviews.md

## What is iJishin?

iJishin – iPhone seismometer, anytime anywhere, measure and browse.

iJishin is a free application that makes your iPhone(iPad, iPod touch) change into a  seismometer and a data browser as well as a vibration analyser. You can upload   seismic information such as maximum acceleration, “SHINDO”(seismic intensity) , occurrence time, and so on, to open your observation to the public.

Please visit:
http://www.geonavi.com:8888/

iJishin also provides you an excellent tool to measure acceleration anytime anywhere on any occasion.

Feel vibration and  measure with iJishin!

 

FEATURES:
iJishin draws full ability as a seismometer from iPhone(iPad, iPod touch). Also it provides tools for wave analysis.
iJishin uses acceleration sensors installed in iPhone(iPad, iPod touch) to measure earthquake vibrations. Signals of three sensors of the device are sampled with frequency of 100Hz and are given the time stamp every 0.01 sec strictly synchronized with UTC by using outer NTP server.
iJishin’s recording process starts/stops when the signal becomes larger/smaller than the triggering level. Allowance durations of the process can be set to save data before/after the signal  grows/attenuates to the threshold triggering level.
iJishin provides you several tools to display and to analyze quake data saved in your iPhone(iPad, iPod touch): not only a wave browser but also a graphical display of power spectrum, of integration such as velocity and displacement, and of the 2D trajectory of the device.

## Key features

- Transforms iPhone into a seismometer
- Measures seismic vibrations
- Analyzes wave data
- Uploads seismic observations
- Graphical display of power spectrum
- Measures velocity and displacement

## Recent user reviews (10 of 30)

All indexed reviews: https://appshunter.io/ios/app/ijishin/id386745649/reviews.md

### 2/5 — 記録が終わらなくて困っています。

*2026-08-17, version 6.1.0*

大きく揺らすとオフセットがずれ、オフセット位置が記録閾値より大きい場合、計測停止をタップするまでは、記録が終わらなくなります。

### 5/5 — 一回地震観測してみたい

*2024-11-13, version 5.1.3*

すいません震度を見ると強制的に終了してしまうので

### 5/5 — 好きなアプリ

*2024-06-16, version 5.1.3*

位置情報が初期設定で送られるのは問題ですが、最初に設定を変えたら大丈夫なのでokだと思います。あとマグニチュードがわからないとか言っている人がいますがわかるわけないだろ。
って友達がっていました。
凄くいいアプリですね。
でもずっとスマホを放置はできないので地震を観測した事はありません。Androidでも使えたらよかった。

### 1/5 — マズイですよ

*2024-02-05, version 5.1.3*

ゆれマップでユーザーの位置情報がバレます。

### 3/5 — ええかんじ

*2023-10-30, version 5.1.3*

⭕️

### 4/5 — クオリティ高い

*2021-04-19, version 5.1.3*

細かい振動も拾うので何も揺れていないように感じるのに、この地震計を見ると揺れていたりするのが分かる。面白いけどアプリ起動してる時に地震が来るとは限りませんね。（来てほしくない）

### 4/5 — いいけど

*2021-03-28, version 5.1.3*

面白いけど、マグニチュードをつけてください

### 5/5 — IJishin

*2018-05-22, version 4.3.1*

Excelente app

### 1/5 — ??

*2017-06-02, version 4.3.1*

?????????????

### 1/5 — ネットワークエラー発生

*2016-11-22, version 4.2.1*

ネットワークエラーでデータを得られません

## Frequently asked questions about iJishin

### 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.

## Version history (last 5 releases)

### 6.1.0 — 2026-07-24

We have fixed a bug relating to uploading data to iCloud.
You can now configure the iCloud upload directory.

### 6.0.0 — 2026-07-17

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.

### 5.1.3 — 2018-08-24

This app has been updated by Apple to display the Apple Watch app icon.

You can share your data files in the cloud storage of your own.
Top screen 'Browser / Analyzer' -> 'Select Data' -> 'Share Recorded Data', select file/files -> 'Share'.
When more than two files are selected, they are uploaded as a zip file.

### 4.3.1 — 2017-05-10

Improved span to retry sending measured data when failed sending.
Added heart beat gap setting menu and functions.

### 4.2.1 — 2016-10-27

Fixed a bug that location information is not reflected until the application is restarted.

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## More apps by Hakusan Corporation

- [iShindo - Seismic Intensity](https://appshunter.io/ios/app/ishindo-seismic-intensity/id720738431)

All apps by Hakusan Corporation: https://appshunter.io/developer/386745652

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*