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MATLAB codes for calculating deformation fields associated with rectangular dislocations (RDs), compound dislocation models (CDMs) and generalized point sources of pressure in homogeneous elastic media Bulletin of the Seismological Society of America, doi: 10.1785/0120110264. The 2011 Mw 9.0 Tohoku Earthquake: Comparison of GPS and Strong-Motion Data. An improved automatic scheme for empirical baseline correction of digital strong-motion records, Bulletin of the Seismological Society of America, 101(5), 2029–2044, doi: 10.1785/0120110039. Ergintav (2009), Afterslip and viscoelastic relaxation following the 1999 M 7.4 Izmit earthquake from GPS measurements, Geophysical Journal International, 178(3), 1220-1237. (5) fast optimization algorithm based on the steepest descent method (4) optional smoothing constraint applied to slip or stress-drop (3) a-priori constraint on the variation range of rake angle (1) incorporating with layered crust structure

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Geophysical Journal International, doi: 10.1093/gji/ggx259.įORTRAN code for inverting co-seismic surface deformation data (GPS, InSAR, etc.) for fault slip distribution. Complete synthetic seismograms based on a spherical self-gravitating Earth model with an atmos-phere-ocean-mantle-core structure. QSSPSTATIC - Co- and post-seismic viscoelastic deformation based on a spherical visco-elastic-gravitational earth model. (5) differential filter technique for suppressing numerical phases (4) complex frequency technique for supressing the time-domain aliasing problem (3) hybrid algorithm (numerical integration for low frequency / small harmonic degrees and analytical propagator algorithm for high frequency / large harmonic degrees) (2) generating Green’s function database or simulating complete seismograms for any given kinematic source model

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(1) all-in-one code for body waves, surface waves, free oscillations, tsunami for uniform ocean, infrasound waves for a standard atmosphere and static deformation

Data, Products, Services GFZ PublicationsĬode for calculating complete synthetic seismograms of a spherical earth using the normal mode theory.Transfer and Innovation Sustainability at GFZ Central Workshop.

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Education and Training Events Archive Earth System Knowledge Platform.

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In addition, the automatic scheme was also successfully used to correct the strong-motion records of a low-cost sensor obtained from a laboratory test. In all test cases, the coseismic displacements recovered from the strong-motion records agree within 10%–20% with direct GPS measurements or indirect model predictions. Case studies on the 1999 Chi-Chi, 2007 Tocopilla, 2008 Wenchuan, and 2010 Maule earthquakes, where the strong-motion data were obtained from different types of accelerometers, show that this automatic scheme is more robust than the previously suggested ones. In this paper, an automatic scheme is presented, in which the method used to determine the baseline shift has a stronger physical basis.

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Other correction schemes, which can be performed by manual calibration, rely on subjective decisions for the choice of correction parameters. In practice, however, the baseline shift is not necessarily accompanying the strongest ground shaking methods based on the threshold approach tend to lead to an over- or underestimation of the true baseline shift. Algorithms, in which an acceleration or other acceleration record derived threshold is used to determine the timing of baseline shift, can be easily implemented.

For this purpose, several empirical baseline correction methods have been proposed. Recent studies have shown that coseismic static displacements can be estimated from modern seismometer records after an appropriate correction for baseline errors that may be caused by rotational motion, tilt, instrument, and other effects. For early warning and rapid hazard assessment, such geodetic measurements are less useful because they are usually available only with a time delay of days to weeks or even longer. The static deformation data are now obtained using space-geodetic measurements. Compared with seismic waves, near-field static deformation can provide more robust constraints on earthquake size and slip distribution because it is less sensitive to the rupture process and Earth structure.