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| Titel |
Instaseis: instant global seismograms based on a broadband waveform database |
| VerfasserIn |
M. van Driel, L. Krischer, S. C. Stähler, K. Hosseini, T. Nissen-Meyer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 6, no. 2 ; Nr. 6, no. 2 (2015-06-16), S.701-717 |
| Datensatznummer |
250115460
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| Publikation (Nr.) |
 copernicus.org/se-6-701-2015.pdf |
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| Zusammenfassung |
| We present a new method and implementation (Instaseis) to store global Green's
functions in a database which allows for near-instantaneous (on the order of milliseconds)
extraction of arbitrary seismograms. Using the axisymmetric spectral element method
(AxiSEM), the generation of these databases, based on reciprocity of the Green's
functions, is very efficient and is approximately half as expensive as a single
AxiSEM forward run. Thus, this enables the computation of full databases at half
the cost of the computation of seismograms for a single source in the previous scheme and
allows to compute databases at the highest frequencies globally observed. By storing
the basis coefficients of the numerical scheme (Lagrange polynomials), the Green's
functions are 4th order accurate in space and the spatial discretization respects
discontinuities in the velocity model exactly. High-order temporal interpolation using
Lanczos resampling allows to retrieve seismograms at any sampling rate. AxiSEM is
easily adaptable to arbitrary spherically symmetric models of Earth as well as other
planets. In this paper, we present the basic rationale and details of the method as well
as benchmarks and illustrate a variety of applications. The code is open source and
available with extensive documentation at www.instaseis.net . |
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