Slip Inversion

Ide, Satoshi

doi:10.1016/b978-0-444-53802-4.00076-2

Cited by 18 publications

(9 citation statements)

References 211 publications

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“…Figure 2b). Details on strong motion data processing are given in Supplementary Text T1 (Ide, 2007;Lee & Lahr, 1972).…”

Section: Observationsmentioning

confidence: 99%

Impulsive source of the 2017, Mw =7.3, Ezgeleh, Iran, earthquake

Gombert¹,

Duputel²,

Shabani³

et al. 2019

Preprint

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On November 12th 2017, a MW =7.3 earthquake struck near the Iranian town of Ezgeleh, close to the Iran-Iraq border. This event was located within the Zagros fold and thrust belt which delimits the continental collision between the Arabian and Eurasian Plates. Despite a high seismic risk, the seismogenic behaviour of the complex network of active faults is not well documented in this area due to the long recurrence interval of large earthquakes. In this study, we jointly invert InSAR and near-field strong-motions to infer the geometry of a flat fault and a kinematic slip model of the rupture. The kinematic slip distribution reveals an impulsive seismic source with a strong southward rupture directivity, consistent with significant damage South of the epicenter. We also show that the slip direction does not match plate convergence, implying that some of the accumulated strain must be partitioned onto other faults.

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“…Figure 2b). Details on strong motion data processing are given in Supplementary Text T1 (Ide, 2007;Lee & Lahr, 1972).…”

Section: Observationsmentioning

confidence: 99%

Impulsive source of the 2017, Mw =7.3, Ezgeleh, Iran, earthquake

Gombert¹,

Duputel²,

Shabani³

et al. 2019

Preprint

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“…The complexity of sources is well-known in crustal seismology, where the sources of large tectonic earthquakes may have dimensions of hundreds of kilometres and may take tens of seconds for the rupture to propagate from one part of the source to another. The spatio-temporal distribution of dynamic slip along faults can be reconstructed from the recorded waveforms using the methods known as finite fault slip inversion or, simply, slip inversion (Ide 2007). The slip inversion methods have two major differences compared to the conventional moment tensor inversion, which was employed in the previous section ( Figure 8):…”

Section: Reconstruction Of Finite Source Characteristics Of a Large Smentioning

confidence: 99%

“…The resulting initiation times are shown in Figure 10. The finite source inversion algorithm allows variation of the origin time for each sub-source around the initiation time and extends the duration of sub-source time functions, which is referred as the multi-time-window method in (Ide 2007).  The seismic waveforms were band pass filtered between 3 and 60 Hz.…”

Section: Reconstruction Of Finite Source Characteristics Of a Large Smentioning

confidence: 99%

Analysis of damaging seismic event on 24 December 2011 in the Pilar Norte sector of El Teniente mine

Malovichko¹,

Cuello²,

Valdivia³

2018

Proceedings of the Fourth International Symposium on Block and Sublevel Caving

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Numerous tunnels of the extraction and undercut levels of the Pilar Norte sector experienced violent damage on 24 December 2011. A seismic event with a moment magnitude of 2.4 was recorded by the mine-wide seismic system at the same time. It is difficult to explain the observed damage with peak particle velocities/peak ground velocities calculated for the basic source parameters of this event (location and magnitude). Seismic data recorded in Pilar Norte in 2011 indicate that failure in the sources is driven by sub-vertical compressional stress. The majority of seismic events located around the undercut level have crush-type source mechanisms (significant implosive component, pancake-shaped deviatoric parts with sub-vertical P-axis) evidencing vertical convergence of the excavations. There are no clear indications of active planar geological structures in the seismic data. The large seismic event that occurred on 24 December 2011 during the blasting sequence and its waveforms are complex. The source mechanism estimated from the low frequency part of the waveforms is of a crush-type. It was hypothesised that the source of this event represents a cascading damage of tunnels. The hypothesis was tested by means of comparing the modelled waveforms of spatially distributed episodes of tunnel damage with the recorded waveforms. A reasonable match was obtained for the scenario including an initial 20 mm convergence of the extraction and undercut drives around the southern Pilar Norte undercut front at a rate of 0.6-0.8 m/s and subsequent spread of smaller (3-6 mm) convergence along the eastern Pilar Norte undercut front and eastern Sub 6 cave abutment at a rate of 0.2-0.4 m/s. There was also significant shearing (ride) deformation along the southern and eastern Pilar Norte cave front. The hypothesis of cascading damage of tunnels also agrees with the underground observations (more than 90% of damage was attributed to the side walls of tunnels) and predictions of sub-vertical orientation of maximum principal stress around the tunnels of the extraction level according to a numerical stress model.

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“…With finite fault inversion methods, slip distribution of strong earthquakes can be inverted with teleseismic P and SH waves, such as the 2013 M w 8.3 Okhotsk earthquake and the 2015 M w 7.8 Gorkha earthquake (Antolik & Dreger, 2003;Avouac et al, 2015;Ide, 2015;Ji et al, 2002;Kikuchi & Kanamori, 1982;Olson & Apsel, 1982;Wei, Avouac, et al, 2015;Ye et al, 2013;Yoshida, 1995). With finite fault inversion methods, slip distribution of strong earthquakes can be inverted with teleseismic P and SH waves, such as the 2013 M w 8.3 Okhotsk earthquake and the 2015 M w 7.8 Gorkha earthquake (Antolik & Dreger, 2003;Avouac et al, 2015;Ide, 2015;Ji et al, 2002;Kikuchi & Kanamori, 1982;Olson & Apsel, 1982;Wei, Avouac, et al, 2015;Ye et al, 2013;Yoshida, 1995).…”

Section: Introductionmentioning

confidence: 99%

“…Broadband seismic waveforms contain abundant temporal and spatial information for studying source rupture process. With finite fault inversion methods, slip distribution of strong earthquakes can be inverted with teleseismic P and SH waves, such as the 2013 M w 8.3 Okhotsk earthquake and the 2015 M w 7.8 Gorkha earthquake (Antolik & Dreger, 2003;Avouac et al, 2015;Ide, 2015;Ji et al, 2002;Kikuchi & Kanamori, 1982;Olson & Apsel, 1982;Wei, Avouac, et al, 2015;Ye et al, 2013;Yoshida, 1995). For moderate earthquakes, the application is limited due to the coarse resolution and low signal-to-noise ratio of teleseismic waveforms.…”

Section: Introductionmentioning

confidence: 99%

Resolving Horizontal Rupture Directivity of Moderate Crustal Earthquake in Sparse Network With Ambient Noise Location

2018

JGR Solid Earth

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Earthquake rupture directivity can remove fault plane ambiguity in earthquake moment tensor solutions; thus, it is helpful to improve reliability of shake map and understanding the seismogenic processes. In this paper, we propose an algorithm to resolve the horizontal rupture directivity of moderate crustal earthquakes in two steps. The first step is to determine the two candidate fault planes from focal mechanism inversion. Then, rupture directivity is estimated via the difference between the hypocenter and the centroid location which is constrained on the candidate fault planes. Accurate centroid location is determined with ambient noise location method, in which the noise cross‐correlation functions (NCFs) provide a stable calibration for the path effects. This technique is applied to the 2011 Oklahoma earthquake, and the estimated centroid location is about 2–4 km southwest to the hypocenter, indicating that the mainshock ruptured along the 234° plane for about 4–8 km. The result is consistent with directivity estimation using a foreshock as reference event and also agrees with early aftershock distribution as well as finite fault inversion. More applications to the 2004 Parkfield earthquake and the 2014 Napa earthquake are performed to explore the effectiveness and limitation of this method. This method is helpful for determining rupture directivity of earthquakes in sparse network but requiring one or two nearby stations. Alternatively, temporary stations can be installed in the area of high seismic hazard, then a library of NCFs and path calibrations would be available for rapidly determining rupture directivity of future earthquakes.

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Slip Inversion

Cited by 18 publications

References 211 publications

Impulsive source of the 2017, Mw =7.3, Ezgeleh, Iran, earthquake

Impulsive source of the 2017, Mw =7.3, Ezgeleh, Iran, earthquake

Analysis of damaging seismic event on 24 December 2011 in the Pilar Norte sector of El Teniente mine

Resolving Horizontal Rupture Directivity of Moderate Crustal Earthquake in Sparse Network With Ambient Noise Location

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