Our early earthquake warning (EEW) efforts encompass developing algorithms, optimising seismic network and processing infrastructure, and the distribution of low-latency alerts. The developed algorithms and software are currently providing public EEW alerts through ShakeAlert and across Central America, contributing significantly to earthquake preparedness and safety.
The Virtual Seismologist method is a Bayesian approach to earthquake early warning that estimates earthquake magnitude, location, and the distribution of peak ground shaking.
The FinDer algorithm uses template matching to rapidly compute finite-source models that provide information on the spatial extent of high-frequency seismic ground motion near the developing fault rupture.
EEW app & display: A mobile phone app that allows agencies operating EEW to directly deliver alerts and a free and open-source java software for displaying earthquake early warnings are available.
A set of three modules are now part of the SeisComP framework that can be used for early warning, implementing the magnitude relations of Virtual Seismologist method.
scenvelope generates real-time envelope values for horizontal and vertical acceleration, velocity and displacement from raw acceleration and velocity waveforms. It was implemented to handle the waveform pre-processing necessary for the scvsmag module. It provides in effect continuous real-time streams of PGA, PGV and PGD values which could also be used independently of scvsmag.
sceewlog logs the VS magnitude messages received from scvsmag and, once an event has timed out, generates report files. These report files are saved to disk and can also be sent via email. It also implements an ActiveMQ interface which provides the possibility to send messages to the EEWD, see below.
scvsmag listens to new origins from SeisComp (currently from scautoloc), and for a given origin it estimates single station magnitudes and a network magnitude based on the Virtual Seismologist envelope attenuation relationship and ground motion amplitude ratios.
A collection of related publications on real-time seismology can be found here.