NIED seismic moment tensor catalogue for regional earthquakes around Japan: quality test and application

Kubo, Atsuki; Fukuyama, Eiichi; Kawai, H.; Nonomura, Ken'ichi

doi:10.1016/s0040-1951(02)00375-x

Cited by 173 publications

(138 citation statements)

References 33 publications

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“…Since the DONET catalogue magnitudes were obtained from the maximum amplitudes of vertical seismograms, it is possible that the estimates were affected by amplification in the soft surface layer of the ocean bottom. Two of the earthquakes, in both the DONET and JMA catalogues, are also listed in the F-net CMT catalogue of the National Research Institute for Earthquake Prediction and Disaster Prevention (NIED) (Fukuyama et al, 1998;Kubo et al, 2002) (see Fig. 8 for their source locations).…”

Section: Comparison With Other Hypocenter Cataloguesmentioning

confidence: 99%

Intensive seismic activity around the Nankai trough revealed by DONET ocean-floor seismic observations

et al. 2013

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Megathrust earthquakes anticipated in the Nankai trough will likely cause severe damage in central and western Japan. The Dense Oceanfloor Network System for Earthquakes and Tsunamis (DONET), a network of permanent ocean-bottom seismic stations for the early detection of earthquakes and tsunamis developed by the Japan Agency for Marine-Earth Science and Technology (JAMSTEC), is in place above the expected source region of such earthquakes. Data from DONET sensors are transmitted in real time to our laboratory at JAMSTEC. Intensive ongoing seismic activity is being detected off the Kii Peninsula by DONET, mainly distributed in three clusters that overlap with the aftershock distribution of the 2004 off the Kii Peninsula earthquakes (M JMA = 7.1 and 7.4), and most of them are also aftershocks of the 2004 earthquakes. Some are linearly distributed on a different trend from the strike of the 2004 foreshock and mainshock fault planes. This result implies that the 2004 events triggered seismic activity on different faults on the subducting Philippine Sea plate. We also observed changes in seismic activity caused by the 2011 Tohoku-oki earthquake. These results could not have been obtained with on-land observations alone, which indicates the importance of DONET for monitoring seismic activity along the Nankai trough.

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Section: Comparison With Other Hypocenter Cataloguesmentioning

confidence: 99%

Intensive seismic activity around the Nankai trough revealed by DONET ocean-floor seismic observations

et al. 2013

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“…synthetic seismograms in laterally homogeneous layered structures. In this experiment, we assumed the layered structure model of Kubo et al (2002) and a doublecouple point source (strike: 70 • , dip: 30 • and rake: −50 • ) placed at a depth of 25 km. The FDM simulation was conducted with a model of 1024 × 1024 × 1024 grid points, a grid size of 0.5 km and a time step of 0.025 s. The reference frequency for Q was set to 1 Hz to match the parameter of the wavenumber integration code.…”

Section: Comparison With the Wavenumber Integration Methodsmentioning

confidence: 99%

OpenSWPC: an open-source integrated parallel simulation code for modeling seismic wave propagation in 3D heterogeneous viscoelastic media

Maeda

Takemura

Furumura

2017

Earth Planets Space

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We have developed an open-source software package, Open-source Seismic Wave Propagation Code (OpenSWPC), for parallel numerical simulations of seismic wave propagation in 3D and 2D (P-SV and SH) viscoelastic media based on the finite difference method in local-to-regional scales. This code is equipped with a frequency-independent attenuation model based on the generalized Zener body and an efficient perfectly matched layer for absorbing boundary condition. A hybrid-style programming using OpenMP and the Message Passing Interface (MPI) is adopted for efficient parallel computation. OpenSWPC has wide applicability for seismological studies and great portability to allowing excellent performance from PC clusters to supercomputers. Without modifying the code, users can conduct seismic wave propagation simulations using their own velocity structure models and the necessary source representations by specifying them in an input parameter file. The code has various modes for different types of velocity structure model input and different source representations such as single force, moment tensor and plane-wave incidence, which can easily be selected via the input parameters. Widely used binary data formats, the Network Common Data Form (NetCDF) and the Seismic Analysis Code (SAC) are adopted for the input of the heterogeneous structure model and the outputs of the simulation results, so users can easily handle the input/output datasets. All codes are written in Fortran 2003 and are available with detailed documents in a public repository.

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“…I use moment tensors from the NIED catalog (Kubo et al 2002) for the Tohoku-Oki earthquake sequence, the Global CMT (GCMT) catalog (Ekström et al 2012) for the Sumatra-Andaman earthquake sequence, and a combined catalog of GCMT solutions and regional moment tensors from Hayes et al (2013) for the Maule earthquake sequence. The Tohoku-Oki earthquake has the densest data coverage, while the Sumatra-Andaman earthquake has the sparsest coverage.…”

Section: Methodsmentioning

confidence: 99%

“…Michael (1991) used synthetic tests to show that the homogeneous part of the stress tensor can be retrieved if it has larger amplitude than the heterogeneous part. For moment tensors with errors of ~15°, like the NIED and GCMT catalogs (Kubo et al 2002;Frohlich and Davis 1999), Michael (1991) found that the homogeneous part of the stress tensor is larger than the heterogeneous part and can be retrieved if the mean misfit is <45°.…”

Section: Methodsmentioning

confidence: 99%

The spatial distribution of earthquake stress rotations following large subduction zone earthquakes

Hardebeck

2017

Earth Planets Space

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Rotations of the principal stress axes due to great subduction zone earthquakes have been used to infer low differential stress and near-complete stress drop. The spatial distribution of coseismic and postseismic stress rotation as a function of depth and along-strike distance is explored for three recent M ≥ 8.8 subduction megathrust earthquakes. In the down-dip direction, the largest coseismic stress rotations are found just above the Moho depth of the overriding plate. This zone has been identified as hosting large patches of large slip in great earthquakes, based on the lack of high-frequency radiated energy. The large continuous slip patches may facilitate near-complete stress drop. There is seismological evidence for high fluid pressures in the subducted slab around the Moho depth of the overriding plate, suggesting low differential stress levels in this zone due to high fluid pressure, also facilitating stress rotations. The coseismic stress rotations have similar along-strike extent as the mainshock rupture. Postseismic stress rotations tend to occur in the same locations as the coseismic stress rotations, probably due to the very low remaining differential stress following the near-complete coseismic stress drop. The spatial complexity of the observed stress changes suggests that an analytical solution for finding the differential stress from the coseismic stress rotation may be overly simplistic, and that modeling of the full spatial distribution of the mainshock static stress changes is necessary.

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NIED seismic moment tensor catalogue for regional earthquakes around Japan: quality test and application

Cited by 173 publications

References 33 publications

Intensive seismic activity around the Nankai trough revealed by DONET ocean-floor seismic observations

Intensive seismic activity around the Nankai trough revealed by DONET ocean-floor seismic observations

OpenSWPC: an open-source integrated parallel simulation code for modeling seismic wave propagation in 3D heterogeneous viscoelastic media

The spatial distribution of earthquake stress rotations following large subduction zone earthquakes

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