## mXrap News and Events

Upcoming Events
23
Sep
mXrap User Case Studies for Mines Seminar

This event is designed to allow mXrap users to share (through presented case studies) their experience of using mXrap and the problems they have been able to address using the software package.

Online
23 September 2024
08:00 - 12:00 EDT
24-26
Sep
Deep Mining 2024

Deep Mining 2024 is an international conference which provides a forum for industry and academia to come together and share research, experience and knowledge on best practice in the area of deep and high stress underground mining.

24-26 September 2024
All Day
5-9
May
Geotechnical Design for Underground Metalliferous Mines Course

This course is designed to develop specific underground metalliferous mining geomechanics design competencies for engineers to enhance their contribution to mine site geomechanics programs.

Perth, WA
Online
5-9 May 2025
08:30 - 12:30 AWST

# mXrap blog

Seismic hazard – sensitivity to b-value
Probabilistic seismic hazard calculations are dependent on the number of events (N) and the b-value. But which has more effect on the hazard result? The chart below shows how seismic hazard varies with b-value for N = 1,000, N = 10,000 and N = 100,000. The seismic hazard in the chart below can be considered in the following way. For a given time span and volume, if N events have been recorded, what is the probability that one of those events was above Mdesign? In this case Mdesign = ML2. Seismic...
What on Earth is MUL?
Yes, this is a frequently asked question…. MUL or MUpper-Limit refers to the truncating magnitude of the Gutenberg-Richter distribution. We used to refer to this as Mmax in the Hazard Assessment app and on the frequency-magnitude chart but we found there was confusion caused by Mmax being used to describe multiple things. Hopefully if we refer to MUL or the upper-limit magnitude, this will clear up the terminology a little. A quick review on the terminology that concerns the frequency-magnitude...
Training video programme
We started making training videos about 12 months ago and feedback has been quite positive. At the last AGM, a suggestion came for a training programme aimed at new users to mXrap. The training videos are currently stored by app but a specific programme would help new users with a logical order for progressing through the training content. We have made a new page for the Training Programme under the Training tab. The programme is structured in several user levels, from a basic introduction to General...
Chart tips - view controls
Charts usually auto-adjust their ranges to the input data. This is often what you want, but occasionally it does make it harder to compare charts with different filters applied. A handy tip is to enable the ‘Zoom and Pan’ option in the top-left. This disables the auto-zoom and pan so then if you change the filter, you can compare the two charts. An example below is the frequency-magnitude chart for all events, compared with the events for just the last month. Enabling the Zoom and Pan...
Quick Reference Guide
Most users are probably aware of the Quick Reference Guide in the Cheat Sheets. It lists all the mXrap shortcuts and hotkeys but it is spread over a few pages and can be a bit tough to find what you’re looking for. Below is a one-page Quick Reference Guide for more of a visual lookup of the main controls. The controls for the new Annotations tool are not included but help for those controls is available in mXrap itself. Here is the PDF version of the one-page guide if you want to print a copy.
To a/b, or not to a/b
The a/b value is sometimes used as a measure of seismic hazard but there are some common mistakes made with this analysis and interpretation. What is a/b? The Gutenberg-Richter distribution is a statistical model that describes a log-linear relationship between the number of events, N, exceeding magnitude, M.  log10 N = a – bM At N = 1, M = a/b. The figure below shows an example of a frequency-magnitude chart with the a/b value highlighted. Does a/b mean anything? It is important to distinguish...
3D distance measuring tool
You can now measure distances in any 3D view in mXrap (version 5.6.0 or later) with the ruler tool in the Annotations tab. The “Annotations tool” training video goes through all the features and the operation. Most operations will probably be for the distance between two points, such as the event-to-survey distance below. You can also extend this to a multi-point ruler for measuring more complicated paths. The controls are very similar to selection boxes. Control instructions are in the...
Changes to mXrap interface - right-hand-side panels
There have been some interface changes made to the mXrap software in versions 5.6.6 or later. The right-hand-side controls have had a bit of a face-lift and now there are separate coloured tabs for exporting, selections, annotations and clipping. The 3D Controls button has also been moved above the series window and the buttons in general have had some styling. We are planning some further changes to Clipping and looking at combining the dynamic clipping controls with the Clipping panel. The eXport...
If you have updated your software to 5.4.0 or higher, you may have noticed some changes to the Survey Import tool. The Survey Setup training video has been updated. The main changes have been to support additional properties from DXF files. DXF text Text objects from DXF files can now be imported into mXrap and displayed in the 3D view. mXrap version 5.5.2 supports TEXT, ATEXT and MTEXT objects. Be aware that there are limits on the maximum number of texts that can be displayed and MTEXT (multi-line)...
What survey formats can be imported into mXrap?
mXrap supports the following survey formats to be used in 3D views: DXF (AutoCAD .dxf) DTM / STR (Surpac .dtm/.str) PNT (.pnt) INP (Map3D Geometry .inp files) Regarding DXF files, this is a complicated format that AutoCAD often updates with new specifications. Our importer will always be behind the latest updates and therefore incompatible with loading in the very newest DXF formats. When exporting your survey files, you should have compatibility options for older formats. Look for ASCII DXF options...
Frequency-magnitude chart anatomy
When you are using the frequency-magnitude chart, it can be easy to forget it is log scale and this can distort a few things. Consider the chart below; have you ever thought the Gutenberg-Richter distribution doesn’t look right? Think it isn’t matching the large events very well? The Gutenberg-Richter distribution is a statistical model of the data. Consider what the chart looks like in linear scale rather than log scale. The difference at the tail of the distribution (largest events)...
Fun and games with mXrap
If you were wondering what a bored Xman does in their free time, this might give you an indication….. You should know by now that mXrap is very flexible and apps can be developed to perform a very wide range of functions. If you were doubting that, this might change your mind 🙂 Ever played the puzzle game known as 2048? Well now there is an mXrap version! The mXrap version has buttons for each of the four moves (up, down, left, right) which controls the game board in the 3D view. If 2048 is...
What's the difference between updating the mXrap software and updating the root folder?
Some things you see in mXrap are properties of the software, while other things are properties of the root folder. We often use the software Excel as an analogy. Excel has many built-in capabilities with endless possibilities for creating specific calculations.  The software has powerful capabilities, but without a user constructing the spreadsheet, the power and value are not fully utilised. An Excel user can set up a spreadsheet which, with the required inputs, will provide you with results....
Why aren't my events updating?
If you notice that you are not getting updated events in mXrap, there are a few possible explanations. In order to troubleshoot the problem, it is good to know exactly how your events are transferred from your seismic database, into mXrap. The first thing to check is if the events are just being filtered out. In the events table, there is a ‘Show All Rows’ option that will disable all filters and show you every event in the database. Sort by descending time and ‘Reload Data’...