# FaultKin Mobile

> Mobile tool for geologists to collect, analyze, and visualize fault slip data. (iPhone/iPad app by Richard Allmendinger.)

- Source: https://appshunter.io/ios/app/faultkin-mobile/id1234264776 (this page in markdown: same URL + `.md`)
- Developer: [Richard Allmendinger](https://appshunter.io/developer/1194772609)
- Category: Education, Utilities
- Price: Free
- Rating: 5.00/5 from 2 App Store ratings
- Age rating: 4+
- Requires: iOS 11.0 · 28 MB
- Languages: American English
- Released: 2017-05-14
- Data updated: 2026-06-01
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/faultkin-mobile/id1234264776/reviews.md

## What is FaultKin Mobile?

FaultKin Mobile is designed to help you collect, visualize, and analyze fault slip data on the go. It is a companion to my FaultKin program for desktop computers, but it can also be used to measure faults on the outcrop. The app has the following features:

- Provide automatic data entry as a geologist's compass by reading the iOS device orientation and converting it to strike and dip of planes and/or trend and plunge of lines.

- Provide manual data entry via either tapping and dragging on the stereonet or by typing values into text fields.

- Groups of faults can be assigned different tags. You will probably want to do this based on location or other criteria. For example, you may want to have a tag labeled "Corral Quemado-Older" and anther "Corral Quemado-Younger".

- Carry out basic calculations such as: rotations about any axis, unfolding faults around local bedding, or measure angles between lines and between planes.

- Plot P and T axes, (unweighted) moment tensor axes, P-T dihedra, fault plane solutions, and contour P and T axes.

- View the plots from any orientation, not just looking straight down into the lower hemisphere

- Stamp each entry with time date and, if enabled by the user, location. See the location of a datum in the iOS Maps program

- Provide basic input and output of data using standard iOS conventions

- Work on both iPhones or iPads, both in portrait mode only.

The desktop version of FaultKin will soon be updated so that it can read and write FaultKin Mobile files, which are simple tab separated text files.

Use it at your own risk. In particular, recall that your iOS device is very sensitive to magnetic fields and the compass bearings can easily be off by 10-20°! This program should not be used as a sole source of navigation data. The author assumes no responsibility for incorrect results, unanticipated behaviors, loss resulting from results provided by the program, or any other anticipated or unanticipated event related to the program.

## Key features

- Automatic data entry via device orientation
- Manual data entry via stereonet or text fields
- Group faults with custom tags
- Perform basic calculations (rotations, unfolding)
- Plot P and T axes, moment tensor axes
- View plots from any orientation
- Stamp entries with time, date, and location


## Frequently asked questions about FaultKin Mobile

### What is FaultKin Mobile used for?

FaultKin Mobile is designed to help geologists collect, visualize, and analyze fault slip data directly on their iOS devices. It can be used as a standalone tool or as a companion to the desktop FaultKin program.

### How does FaultKin Mobile collect data?

The app offers automatic data entry by reading the iOS device's orientation to determine strike and dip of planes or trend and plunge of lines. Manual data entry is also available through tapping on a stereonet or typing values.

### Can I organize my fault data with FaultKin Mobile?

Yes, you can assign different tags to groups of faults. This allows you to categorize your data based on criteria like location or age, for example, "Corral Quemado-Older" and "Corral Quemado-Younger".

### What types of calculations can FaultKin Mobile perform?

FaultKin Mobile can perform basic calculations such as rotations about any axis, unfolding faults around local bedding, and measuring angles between lines or planes.

### Does FaultKin Mobile have ads?

No, FaultKin Mobile does not contain advertisements. It is a free application with no in-app purchases or ads.

### What devices is FaultKin Mobile compatible with?

FaultKin Mobile is designed to work on both iPhones and iPads. It supports portrait mode only.

### How accurate is the compass data in FaultKin Mobile?

The app's compass bearings can be off by 10-20° due to the sensitivity of iOS devices to magnetic fields. It is recommended not to use this program as the sole source of navigation data.

### How often is FaultKin Mobile updated?

The latest version of FaultKin Mobile is 3.0.0, last updated on March 13, 2024. The developer plans to update the desktop version to read and write FaultKin Mobile files.

## Version history (last 5 releases)

### 3.0.0 — 2024-03-13

V. 3.0.0 -- 12 March 2024

This version of FaultKin Mobile (FKM) has been substantially rewritten and modernized with new functionality and data reliability. Major changes include:

• FKM now keeps your data for each project in a separate Sqlite database, an open database format. The first time you run the new app, FKM will automatically import your data into the new format. For the utmost in data security, prior to updating you may want to send your existing data to yourself using the sharing panel in the Data Screen. The next version of FaultKin desktop will be able to import FKM database files.

• Your data are now saved automatically (both individual measurements and complete projects). You no longer have to save them manually. In the Datum Details screen, the Save button in the old version has now been replaced by a Revert button. If you make changes to a datum in that screen, those changes will automatically update the database UNLESS you tap the revert button. Projects remain active until you open or create a new project. When you create a new project, you will be given the opportunity to transfer all existing data into the new project. Prior to creating a project, your observations are kept in a Random Obs database.

• Your data are now accessible from the Files App on your iPhone or iPad. From there you can easily share the database using iCloud Drive, AirDrop, or other Apple sharing technologies. You can also delete files that you no longer need but, be careful, once they are gone you will not be able to retrieve them again unless you have copied the files to your desktop/laptop.

• The interface has been modernized and rearranged to match the interface of Stereonet Mobile with buttons performing the same function now located in the same places.

• The export button on the Main Screen (with the stereonet view) will now enable you to share a PDF of the current plot via email, messages, copied to the pasteboard, or shared via AirDrop, etc.

• The Map screen now allows you to measure distances or relocate a datum by tapping on the map screen at the appropriate spot. The datum is moved to the spot where you lift your finger from the screen. You can also use the new Lasso tool in the map screen to select data to Show, Hide, Delete, or Export. The Show command will just show the data inside the lasso and will hide all of the others.

• When you are entering text in the Datum Details screen, the button in the upper right corner of the screen will change to allow you to use that button to dismiss the keyboard when you tap it. When the keyboard isn't showing, it will revert to the More… button.

• Swiping left on a datum in the Data List Screen will now dsplay three buttons allowing you to hide/show, delete, or show on a map that individual datum.

• A datum collected with the auto orientation from device orientation feature will automatically have latitude and longitude associated with it, even if you did not explicitly turn on GPS (this is possible because auto orientation requires GPS to be turned on, at least temporarily, in order to use the correct magnetic declination).

• New Toolbar icons for buttons match those used in Stereonet Mobile.

• The documentation is now local to the device.

### 2.1.0 — 2019-11-11

v. 2.1.0  10 November 2019

This version brings major compatibility improvements with iOS 13: sharing sheets no longer freeze, minor improvements to maps, formatting improvements, etc. There is no new scientific functionality in this version. Nonetheless, if you are running a recent version of iOS, upgrading is highly recommended!

### 2.0.6 — 2017-08-23

v. 2.0.6 -- fixes a non-critical bug with point symbols that was inadvertently introduced in the last version.

v. 2.0.5 -- fixes a crashing bug that was introduced in v. 2.0

Please feel free to submit bug reports via my web page if you experience problems with any of my programs

### 2.0.5 — 2017-08-21

v. 2.0.5 Fixes a recently introduced but serious crashing bug that happened when a blank recovery file was written under a particular set of circumstances and then the program attempted to read it in on start up. Judging from my crash logs, it appears that a number of you were bitten by this bug -- my apologies. If you ever experience crashing of FaultKin Mobile, please do not hesitate to report it on my support web page. This version has no new functionality but you will definitely want to download this one!

### 2.0.2 — 2017-07-25

v. 2.0 -- Now with in-app mapping capabilities

• Display your fault slip data on a map or satellite image within the program from either the data list view or datum details view. From the data list view, you have the option of showing a separate fault plane solution (FPS) for each measurement or the average for all showing measurements calculated using an unweighted moment tensor sum. The FPS for a single datum or for the average of several measurement also shows the P and T axes.

• The RecoveryFile now records all of your changes and any existing recovery file is read in automatically when you launch the program, allowing you to resume wherever you left off even if iOS has purged the program from memory. The format of the Recovery file has changed slightly to accommodate these changes and FaultKin on the desktop will be changed to read in the new format.

• Minor bug fixes and improvements.

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## More apps by Richard Allmendinger

- [Stereonet Mobile](https://appshunter.io/ios/app/stereonet-mobile/id1194772610)
- [Strat Mobile](https://appshunter.io/ios/app/strat-mobile/id1289101464)
- [Chocorua Map](https://appshunter.io/ios/app/chocorua-map/id1475276985)
- [GMDE Lite](https://appshunter.io/ios/app/gmde-lite/id1557325241)
- [White Mtn Hiker Pemi](https://appshunter.io/ios/app/white-mtn-hiker-pemi/id1580650866)

All apps by Richard Allmendinger: https://appshunter.io/developer/1194772609

## Related topics

[faultkin mobile](https://appshunter.io/ios/topics/faultkin-mobile) · [stereonet mobile](https://appshunter.io/ios/topics/stereonet-mobile) · [king richard](https://appshunter.io/ios/topics/king-richard)

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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 2026-06-01.*