# Strong Motion Monitor Viewer — Confirm earthquake in Japan.

> View and monitor earthquake data from Japan's National Research Institute. (iPhone/iPad app by Thirdocean, Ltd..)

- Source: https://appshunter.io/ios/app/strong-motion-monitor-viewer/id667092278 (this page in markdown: same URL + `.md`)
- Developer: [Thirdocean, Ltd.](https://appshunter.io/developer/447030976)
- Category: Weather
- Price: Free
- Rating: 3.90/5 from 7 App Store ratings · 52 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 26 MB
- Languages: American English, Japanese
- Released: 2013-07-22
- Data updated: 2026-09-02
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/strong-motion-monitor-viewer/id667092278/reviews.md

## What is Strong Motion Monitor Viewer?

I own app to Strong Motion Monitor the site found in the National Research Institute for Earth Science and Disaster Prevention, Japan.
The URL hard-coded, such as might not see the site design changes.

You can enter the setting screen from Settings app.
The items that can be set,
• Sleep invalid setting
• background map, white / black / Appearance interlocking(iOS13 or higher) selection
• Type setting of the screen next to the time left map and portrait screen time
• Type setting of the screen next to the time right map in landscape screen(or portrait screen of iPad)
• Server data acquisition offset time
※ Please try to adjust when the blank map is frequently displayed, processing of server is heavy (for example, -4 seconds to -6 seconds)
• selection of Strong Motion Monitor server

Should be done than notification items in the Settings app notification settings.

The following operations are possible in the portrait screen display.
• In the lower left button, the type of setting horizontal screen when left map and vertical screen time
• At the bottom right button, the type of setting right next to the screen during map
• In slide bar at the bottom left and display the data for up to one hour past
• In button on the slide bar left and right to move data around 2 seconds
• The return to the latest data displayed in a button press on the bottom right in the past at the time data display
• In iOS6 or more, you can send the image to Twitter, such as by pressing and holding the map.
• You can switch the type of map by swiping left and right on the map. (Left:Surface PGA -> Surface -Seismic intensity -> Borehole-PGA -> Borehole-Seismic intensity -> Surface PGA, Right:Surface PGA -> Borehole-Seismic intensity -> Borehole-PGA -> Surface -Seismic intensity -> Surface PGA)

## Key features

- Real-time earthquake monitoring
- Customizable map backgrounds
- Adjustable data display settings
- Server data offset adjustment
- Share earthquake images to Twitter
- Map type switching

## Recent user reviews (10 of 52)

All indexed reviews: https://appshunter.io/ios/app/strong-motion-monitor-viewer/id667092278/reviews.md

### 5/5 — Exactly what I wanted

*2026-05-06*

iOS is having trouble viewing this data on their website, and not only does this app easily present you this information-rich data better than Yahoo or JMA, it also adds notifications and recent reviews - both things that make this the best way to view the website. I hope the dev adds custom notification sounds, so we can set a unique sound for these EQ notifications.

### 3/5 — 自分のスマホだけかもしれませんが...

*2026-04-27, version 1.8.8*

いいんです、アプリ自体は
とてもいいアプリなんです
でも、自分のスマホだけかもしれませんがずーっとずーっと止まったり動いたりを繰り返しています。
なんで？？？？
どうにか改善できませんかね

### 2/5 — 最近はちょっと…

*2026-04-20, version 1.8.8*

随分と長く利用させていただいていますし、頼りにしているのですが、最近は利用する方が増えたのか、理由は分かりませんが、地震が起きると、画面の表示が読み込み中でクルクルしたままで、表示が進まず、S波の動きが見れなくて困っています。

### 3/5 — 不具合？

*2026-04-01, version 1.8.8*

まだ改善されないです
2026/04/02

リアルタイムで見れるのでこれがいちばん落ち着けて安心します。
ただ最近不具合でずっとグルグルしてるので改善されて欲しい

### 4/5 — 便利

*2026-03-31, version 1.8.8*

どこよりも情報が早く、すごく重宝しています。

私だけかもしれないのですが、最近、地震発生直後にアプリを開いてS波・P波を見ていると、すぐに読み込み中表示が出て、画面が固まるようになりました。
ご確認お願いします。

### 5/5 — 通知がありがたい

*2026-02-20, version 1.8.6*

事情があって在住地以外の地震も知りたいので、履歴と通知がありがたい

通知の震度設定を6弱以上か未満かだけでなく、速報が出ない震度2以下だけオフに切替られるとありがたい

### 3/5 — 通知と履歴がストップ

*2026-02-19, version 1.8.6*

数日前から履歴が古いまま更新されず、それに伴ってか今日も地震があったのに通知が来ませんでした。改善してほしいです。

### 4/5 — 心強い

*2026-02-13, version 1.8.6*

地震波が伝わって来るのが目視出来るので 心構えができて助かります。他の人の声にもありますが 全ての発生の通知が来ると慣れてしまうので 通知震度が設定できると 有難いです

### 4/5 — 通知設定させてほしい

*2025-11-21, version 1.8.3*

長年このアプリを利用しています。たった1秒でも気持ちに余裕が作れるので非常に助かっています。ただ遠方の微弱な揺れまで通知されるので、地域や震度4以上のみ通知する等の設定ができるようにしてください。よろしくお願いします。

### 3/5 — このところ誤報が続く..

*2025-08-18*

2025年8月18日
ひと月ほど前からちょっとおかしい。きょうも東海方面で、実際の震度が１なのに４超と２件のアラートを出すものだから、慌てて連絡とったりで迷惑。元データの分析に問題が出てる？　いくつか入れている他の防災アプリもテレビもなにも発報はなかったから、このアプリに問題が生じているのは確か　かなり前から使っていたけどしばらく外れてもらう。

## Frequently asked questions about Strong Motion Monitor Viewer

### Does Strong Motion Monitor Viewer have ads?

Yes, Strong Motion Monitor Viewer contains advertisements. This is indicated by the app's ad-supported monetization model.

### What is the rating for Strong Motion Monitor Viewer?

Strong Motion Monitor Viewer has a rating of 3.7 stars based on 6 user reviews.

### Is Strong Motion Monitor Viewer free to download?

Yes, Strong Motion Monitor Viewer is available for free download. Its monetization comes from advertisements.

### What devices is Strong Motion Monitor Viewer compatible with?

Strong Motion Monitor Viewer is compatible with iPhone, iPad, and iPod devices.

### What is the age rating for Strong Motion Monitor Viewer?

Strong Motion Monitor Viewer has an age rating of 4+, making it suitable for a wide audience.

### When was Strong Motion Monitor Viewer last updated?

The latest version of Strong Motion Monitor Viewer was last updated on March 17, 2026.

### Can I adjust server data acquisition time in Strong Motion Monitor Viewer?

Yes, you can adjust the server data acquisition offset time in the settings. This can help when a blank map is frequently displayed due to server load.

### How can I share earthquake data from Strong Motion Monitor Viewer?

You can send images of earthquake events to Twitter by pressing and holding the map, provided you are using iOS 6 or later.

## Version history (last 5 releases)

### 1.8.8 — 2026-03-17

- Minor corrections

### 1.8.7 — 2026-03-11

- Updated to support iOS 13 and later
- Library and tool updates

### 1.8.6 — 2026-02-01

- Supported version changed to iOS 13 and above
- Minor fixes

### 1.8.5 — 2026-01-14

Minor fixes

### 1.8.4 — 2026-01-02

- Minor stability fixes

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## More apps by Thirdocean, Ltd.

- [FukuichiViewer](https://appshunter.io/ios/app/fukuichiviewer/id447030973)

All apps by Thirdocean, Ltd.: https://appshunter.io/developer/447030976

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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 2026-09-02.*