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Normal Mode (Mineos Package) Tutorial

Normal Mode (Mineos Package) Tutorial. Background and theory of normal mode synthetic seismograms provided by Guy this AM. Brief overview of the code: 4 programs, I/O flow. To Run the Code: Inputs needed, CSS data base description & Antelope interface. Example outputs.

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Normal Mode (Mineos Package) Tutorial

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  1. Normal Mode (Mineos Package) Tutorial • Background and theory of normal mode synthetic seismograms provided by Guy this AM. • Brief overview of the code: 4 programs, I/O flow. • To Run the Code: Inputs needed, CSS data base description & Antelope interface. • Example outputs. • Utilities: e.g., conversion to SAC waveforms. • Users run programs….. Led by Misha….. Author: Guy Masters I/O and documentation: Misha Barmin

  2. Status & Documentation Status of the code: the code is being Beta tested right now. Version 1.0 has not been completely bench-marked. The official version will become available from CIG (www.geodynamics.org) in about a month. Please don’t take the code home. If you do take the code home, DO NOT DISTRIBUTE IT, and replace it with the official version soon to become available from CIG. Documentation you should have: Mineos Version 1.0 (Draft) User’s Manual Tutorial: The Mineos Package

  3. 2. The Code Four programs in the Mineos Package: Eigenfunction System Minos_bran -- computes the eigenfunctions and eigenfrequencies. Eigcon -- renormalizes the eigenfunctions and outputs into an extension of CSS. (.eigen relation) Green -- computes Green functions. (.wfdisc) Syndat -- computes the synthetic seismograms. (.wfdisc) Synthetic Seismogram System

  4. 2. I/O Flow Eigenfunction System

  5. 2. I/O Flow Synthetic Seismogram System

  6. 3. To Run the Code: Inputs Needed • 1D model. (four models provided for the tutorial) • Station:channel list: .sitechan & .site from CSS3.0. • CMT solution: cmt_event -- unformatted ascii file. (Similar to Guy’s locale file.) • To create .sitechan & .site: • Research: comparing with data, use a SEED volume • and run RDSEED or sd2db or seed2db. • Teaching: utility simpledit helps. To create cmt_event: Simple unformatted file. Create by hand. (A later version will have a utility for converting from Harvard CMT file.)

  7. Center for Seismic Studies 3.0 Relational Data Base Schema Relational Data Base Terminology: File = “Relation” Row = “tuple” Specific set of columns = “Field” Connecting tables = “Join” • Disadvantage of utilizing CSS3.0: • Although in ascii, the relations are formatted files and • format must be followed religiously. • Relevant information sometimes requires multiple files. • (e.g., .site & .sitechan; .origin, .centryd, .moment) • Advantage: • Core schema is well defined and documented. • Processing/Viewing software exists (Antelope). • Format interconversion software exists. • Easily extendable.

  8. .site .sitechan-- also connects to .sensor .sensor .instrument .event .origin-- needed only to create SAC files. .centryd .moment Center for Seismic Studies 3.0 Relational Data Base Schema Our Approach: hybrid -- take core relations from CSS3.0 & minimally extend it, but also represent event information with a simple unformatted ascii file. .wfdisc --> waveforms on disk Extension: .eigenrelation --> eigenfunctions on disk. Event information: unformatted file event_cmt.

  9. 4. Example Outputs Outputs: Eigcon: .eigen relation --> eigenfunctions on disk. Utility preigen prints chosen eigenfunctions. Green: .wfdisc relation --> multiplexed Green functions on disk. Syndat: .wfdisc relation --> synthetic seismograms on disk. Units: ground motion (nm/sec), no instrument responses. Waveforms viewable with Antelope’s dbe or dbpick.

  10. Example: event in S. China, spheroidal & toroidal, 0 < n < 150, 0 < f < 166 mHz, 0 < l < 10000. These results are in directory /Demo1

  11. Phase arrivals generated by dbpick using iaspei model.

  12. Phase arrivals generated by dbpick using iaspei model.

  13. 5. Utilities simpledit -- to create .site & .sitechan tables. preigen-- prints chosen eigenfunctions. create_origin-- creates an .origin table from a cmt_event table. css2sac-- reads .origin, .site, .sitechan, and .wfdisc and creates SAC waveform files with fully populated headers.

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