Temblor forecasts global seismicity, estimates home damage, provides insights, visualizes flood, liquefaction, landslide hazards.

Funded by the NSF SBIR program


Half of the world’s population lives near active faults, and so could suffer earthquake damage. Most do not know they are at risk; many of the rest do too little, too late.

Temblor enables everyone in the conterminous United States, and eventually the world, to learn their seismic hazard, to determine what most ensures their safety, and to decide what best reduces their risk.

Temblor works anywhere in the United States, using the best available public data and methods. Our goal is to make earthquake risk ‘real,’ without scaring, soothing, or snowing people. Navigating through Temblor, is quick, fun, and easy. Info buttons explain its calculations, estimates, and data sources.

In Temblor’s map you can see the faults and recent quakes around you; use your current location or enter an address. Temblor typically shows magnitude-1.0 or larger quakes in the U.S, and magnitude-4.5 or larger in the rest of the world; the quakes are updated every few minutes. You can click on any quake for more information. Everything is identified in map legends.

The Temblor Seismic Hazard Rank slider lets you know how your location compares to the most and least hazardous sites in the coterminous U.S. By moving the pin around, you can see how your hazard changes, and how it compares to other areas in your commute zone or nearby.

By entering your home’s age and size, Temblor estimates the chances of seismic damage and the cost of repairs in an intuitive, interactive pie chart. Temblor also estimates the cost, and financial and safety benefits of a bolt-and-brace retrofit to your home, so you can assess if this makes sense for you. In addition, Temblor estimates the chances of a payout for a typical earthquake insurance policy for your home at your location.

In an interactive bar chart, Temblor also puts your seismic risk in context. The chart compares your chance of extensive earthquake damage to other perils that most people protect themselves from or insure against, such as a your home burning down or your car being totaled.

In Temblor’s layers menu, you can add liquefaction zones (which can cause a home to sink or tilt when shaken), and landslides (which can cause a home to slide downhill during a quake, or be covered in debris). You can also use a relief map, route map, or satellite image as a base, and zoom in as close as you wish.

Temblor is free and ad-free. Please share Temblor with your friends and family to help our mission to live stronger together.

What's New

Version 3.2.1

Easy to share a location with friends
Better suggestions in address search
Several bug fixes

Ratings and Reviews

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.

Love love love it!


I love that the app gives me recents earthquakes around my area and my hazard risk of my home. I also like that the people who came up with this app are scientist so the information is coming from a creditable source. I went to the actual website and they have tons of blogs on recent earthquakes so I can understand more and not just have news but actual earthquake info in detail! Can't wait until next update.

Love this program!


This app is really nice, well designed, and really easy to use. I had some personal questions on the app preferences and the creator sent a response within 15 minutes of my email being sent! Impressive!!! Give this program a try, you will like it.


Temblor, Inc.
13 MB
Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© Temblor, Inc
In-App Purchases
  1. Unlock Additional Notification Criteria and Remove Ad's $0.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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