Transcript Normal Mode (Mineos Package) Tutorial

Normal Mode (Mineos Package)
Tutorial
Author: Guy Masters
I/O and documentation: Misha Barmin
1. Background and theory of normal mode synthetic
seismograms provided by Guy this AM.
2. Brief overview of the code: 4 programs, I/O flow.
3. To Run the Code: Inputs needed, CSS data base
description & Antelope interface.
4. Example outputs.
5. Utilities: e.g., conversion to SAC waveforms.
6. Users run programs….. Led by Misha…..
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
2. The Code
Four programs in the Mineos Package:
Minos_bran -- computes the eigenfunctions and
eigenfrequencies.
Eigenfunction
System
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
2. I/O Flow
Eigenfunction
System
2. I/O Flow
Synthetic
Seismogram
System
3. To Run the Code: Inputs Needed
1. 1D model. (four models provided for the tutorial)
2. Station:channel list: .sitechan & .site from CSS3.0.
3. 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.)
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.
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.
.site
.sitechan -- also connects to .sensor
.sensor
.instrument
.wfdisc --> waveforms on disk
.event
.origin -- needed only
to create SAC files.
.centryd
.moment
Extension: .eigen relation --> eigenfunctions on disk.
Event information: unformatted file event_cmt.
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.
Example: event in S. China, spheroidal & toroidal, 0 < n < 150,
0 < f < 166 mHz, 0 < l < 10000.
These results are in directory /Demo1
Phase arrivals generated by dbpick using iaspei model.
Phase arrivals generated by dbpick using iaspei model.
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.