G-larmS - Geodetic Alarm System
A collaborative effort of the
Berkeley Seismological Lab and New Mexico Tech

G-larmS - Geodetic Alarm System

The Geodetic Alarm System, G-larmS, is a cooperation between New Mexico Tech and the Berkeley Seimsological Laboratory at UC Berkeley. Its primary purpose is the real-time analysis and modeling of surface displacement time series as recorded by GPS. A secondary benefit emerges from its simulation mode, which enables the modeling of time series after the fact; in a simulated real-time manner. The latter fulfills two purposes, (1) utilize and test as much of the real-time code as possible and (2) provide a framework for scientific analysis of deformation signals.

It should be emphasized that G-larmS expects time series as input and does not analyze raw GPS observations, i.e. it does not solve the position problem. We utilize other tools such as trackRT, RTNet, rtGIPSY etc. do this in real-time. In simulated real-time mode, we utilize post-processed timeseries from GPS processors such as GAMIT/GLOBK, GIPSY etc.

G-larmS inverts absolute position changes, relative position changes, or a mix of both for slip on a coarsely discretized fault (see test cases) that is centered on the hypocenter derived from the seismic system. The fault geometry (strike, dip, depth), i.e. the non-linear part of the inversion, is currently pre-specified. However, we solve for multiple geometries in parallel (e.g., San Andreas Fault parallel / conjugate, Mt. Diablo Thrust Fault) and select the best solution in an RMS sense. This is necessary to speed up the processing for real-time applications.



Videos for the test cases are all reprocessed and uploaded to YouTube; showing current capabilities.


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| Last modified: September 08 2015 22:15.