1. What is GISMO?
2. GISMO core
   • waveform
   • correlation
   • Catalog
3. Contributed code

What is GISMO?

GISMO is a MATLAB toolbox for seismic data analysis built on a common platform. In particular, GISMO provides a framework that speeds the development time for building research codes around seismic waveform/trace data, event catalog data and instrument responses. GISMO can import data from IRIS DMC, SAC & Seisan files, Antelope databases, and from ZMAP and CORAL format. With minimal coding, other formats can be imported.

• makes playing with data easier by automating the tedious aspects of data manipulation
• makes programs more stable by ensuring proper data typing
• makes code more portable by reading multiple formats and functioning on multiple systems
• makes troubleshooting faster by providing more detailed messages and warnings
  
• provides a common framework that researchers can use to develop compatible codes
  

• GISMO core data types and toolkits
• an ever-evolving set of contributed codes developed from these core products

GISMO core

waveform

The waveform data type - represents timeseries data, keeping it together with relevant metadata. Features include:

• Load seismic waveform data from a variety of data sources (e.g. IRIS DMC, Earthworm/Winston waveservers, Antelope databases) and formats (e.g. Seisan, SAC, MiniSEED)
• Basic manipulations of waveform data, e.g. fill gaps, detrend, taper, filter, integrate, differentiate, stack, extract
• Plot seismograms, helicorders, spectrograms
• Various statistics, e.g. mean, rms, max, min
• Can handle thousands of traces at a time
• Forms the backbone of much of GISMO

correlation

Allows a great variety of comparisons between seismic traces, such as:

• max correlation and lag time determination for all event pairs
• Dendrogram-type hierarchical clustering of event families (multiplets)
• Basic manipulations e.g. filter, crop, subset, stack, normalize, automatic gain control
• Waveform interferometry
• Optimized differential arrival times
• Excellent tool for analysis of earthquake swarms
• Built on the waveform suite, but a few features (linkage, cluster and dendogram plotting) require the Statistics toolbox.

Catalog

Handles earthquake metadata such as origin times, lat/lon/depth coordinates, magnitudes, arrivals. Features include:

• Load event catalogs from IRIS DMC, USGS data feeds, Antelope databases, Seisan databases, ZMAP.
• Save event catalogs to Antelope databases.
• Plot hypocenters, magnitudes, event rates, energy release rates.
• Compute b-values, magnitude of completeness.
• Summary statistics