Synthetic Green's Functions to Support Teleseismic Seismic Depth Modeling

Citation

Yeck, W.L., Herrmann, R.B., Benz, H.M., and Patton, J.M., 2021, Synthetic Green's Functions to Support Teleseismic Seismic Depth Modeling: U.S. Geological Survey data release, doi:10.5066/P996KCPK

Summary

These data are synthetic Green's functions used to generate synthetic seismograms for teleseismic waveform modeling purposes to estimate seismic source characteristics. Primarily, these sets of Green's functions are used by the USGS National Earthquake Information Center to perform depth phase modeling using the SynDepth software package (https://code.usgs.gov/ghsc/neic/syndepth). These Green's functions were generated using the software package Computer Programs in Seismology (Herrmann, 2013). Green's functions were generated either following the Hudson (1969) method using the hudson96 program or through the wavenumber integration method using hspec96. The data release contains two file types. hdf5 files contain Green's functions [...]

Summary

These data are synthetic Green's functions used to generate synthetic seismograms for teleseismic waveform modeling purposes to estimate seismic source characteristics. Primarily, these sets of Green's functions are used by the USGS National Earthquake Information Center to perform depth phase modeling using the SynDepth software package (https://code.usgs.gov/ghsc/neic/syndepth). These Green's functions were generated using the software package Computer Programs in Seismology (Herrmann, 2013). Green's functions were generated either following the Hudson (1969) method using the hudson96 program or through the wavenumber integration method using hspec96.

The data release contains two file types. hdf5 files contain Green's functions as a function of distance (typically 30°-90° in increments of 1°) and depth (typically 1-700 km in increments of 1 km), and associated metadata regarding the Green's function hdf5 file. The .mod files specify velocity models used to generate these Green's functions. Metadata in each hdf5 is saved as attributes to the hdf5 file and includes:

'Depth Min (km)' - The minimum source depth in km. The receiver depth is always set to 0 km.
'Depth Max (km)' - The maximum source depth in km.
'Depth Step (km)' - The step size in km between depth slices.
'Dist Min (deg)' - The minimum distance between source and receiver in degrees.
'Dist Max (deg)' - The maximum distance between source and receiver in degrees.
'Dist Step (deg)' - The step size between distance slices in degrees.
'NPTS' - The number of points in each waveform.
'Length (s)' - The length of each waveform in seconds.
'Phase Type' - The phase-type (typically P or S) that Green's functions are timing are relative to.
'Pre Signal Buffer (s)' - The number of seconds prior to the phase (typically P or S) arrival.
'Receiver Model' - The velocity model at the receiver.
'Source Model' - The velocity model at the source.
'Teleseismic Model' - The velocity model of the earth between the source and receiver.
'Sample Rate (s) - The sample rate of the waveform in seconds.
'Type' - More details on the method used to generate the file.

The data array of the Green's functions in the HDF5 file is formated following array['component'][depth_index,distance_index,npts] where 'component' is the Green's function component (e.g., ZEX, ZDD, etc.), and depth_index and distance_index are the indexes given a depth or distance. These can be computed following:
distance_index = (X-'Dist Min (deg)') / 'Dist Step (deg)'
depth_index = (X-'Depth Min (km)') / 'Depth Step (km)'

The components of Green's function are defined following Wang and Herrmann (1980). The first letter (Z ,R, T) indicates the component of motion. The second two letters indicate the source type:

DS - Dip Slip Source
SS - Strik Slip Source
DD - 45-degree Dip Slip Source
EX - Explosion Source

Included are 4 Green's function files hdf5 files:

tak135sph.hdf5 - Generated using the Hudson method with AK135 crustal model for source, receiver, and teleseismic model.
tak135sph_OceanSource.hdf5 - Generated using the Hudson method with AK135 crustal model for the receiver, and teleseismic model, and AK135 ocean model for the source.
tak135sph_WUSsource.hdf5 - Generated using the Hudson method with AK135 crustal model for the receiver, and teleseismic model, and WUS model for the source.
tak135sph_CUSsource.hdf5 - Generated using the Hudson method with AK135 crustal model for the receiver, and teleseismic model, and CUS model for the source.

All four of these files were generated using a source with a moment of 10^13 Newton-Meters.

The velocity model files are in the model96 format, described in Herrmann (2013) its associated software package.

Citations:

Herrmann, R. B. (2013) Computer programs in seismology: An evolving tool for instruction and research, Seism. Res. Lettr. 84, 1081-1088, doi:10.1785/0220110096

Hudson, J.A. (1969), A Quantitative Evaluation of Seismic Signals at Teleseismic Distances—II: Body Waves and Surface Waves from an Extended Source. Geophysical Journal of the Royal Astronomical Society, 18: 353-370. doi:10.1111/j.1365-246X.1969.tb03574.x

Wang, C.Y. and Herrmann, R.B., (1980) A numerical study of P-, SV-, and SH-wave generation in a plane layered medium. Bulletin of the Seismological Society of America, 70(4), pp.1015-1036. doi:10.1785/BSSA0700041015

Contacts

(other) :: Yeck, William L, Benz, Harley M, Herrmann, Robert B, Patton, John

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GHSC_Earthquake_SynDepth_GFs_MetaData.xml Original FGDC Metadata	View	11.07 KB	application/fgdc+xml
		5.11 GB	application/x-hdf
tak135sphocean.mod		11.98 KB	text/plain
tak135sph.mod		11.61 KB	text/plain
WUS.mod		779 Bytes	text/plain
CUS.mod		584 Bytes	text/plain
		5.11 GB	application/x-hdf
		5.11 GB	application/x-hdf
		5.11 GB	application/x-hdf

Type	Scheme	Key
DOI	https://www.sciencebase.gov/vocab/category/item/identifier	doi:10.5066/P996KCPK
USGS_ScienceCenter	https://www.sciencebase.gov/vocab/category/item/identifier	Geologic Hazards Science Center
USGS_MissionArea	https://www.sciencebase.gov/vocab/category/item/identifier	Natural Hazards
USGS_keywords	https://www.sciencebase.gov/vocab/category/item/identifier	Seismology

Synthetic Green's Functions to Support Teleseismic Seismic Depth Modeling

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