Seismic recordings of landslides caused by Typhoon Talas (2011), Japan

Yamada, Masumi; Matsushi, Yuki; Chigira, Masahiro; Mori, Jim

doi:10.1029/2012gl052174

Cited by 93 publications

(108 citation statements)

References 15 publications

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“…In their studies, Surinach et al (2005) and Dammeier et al (2011) reported that rockfall spectrograms show a typical triangular shape that could be related to source effects, material entrainment during propagation and/or progressive failure and individual block impacts (Norris, 1994;McSaveney and Downes, 2002). All these characteristics can be used for event detection at different scales (Helmstetter and Garambois, 2010;Yamada et al, 2012;Kao et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…As no clear P and S waves are visible on seismograms, conventional earthquake location techniques cannot be applied. Specific methods have been developed, based on the seismogram envelope (Yamada et al, 2012(Yamada et al, , 2013, amplitudes (Battaglia et al, 2003), wave polarization (Vilajosana et al, 2008), signal cross-correlation (Lacroix and Helmstetter, 2011) and arrival times (Hibert, 2012). Due to the emergent seismogram onset, this last technique requires advanced picking methods (e.g., Baillard et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Seismic and mechanical studies of the artificially triggered rockfall at Mount Néron (French Alps, December 2011)

Bottelin

Jongmans

Daudon

et al. 2014

Nat. Hazards Earth Syst. Sci.

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Abstract. The eastern limestone cliff of Mount Néron (French Alps) was the theater for two medium-size rockfalls between summer and winter 2011. On 14 August 2011, a ∼ 2000 m 3 rock compartment detached from the cliff, fell 100 m below and propagated down the slope. Although most of the fallen rocks deposited on the upper part of the slope, some blocks of about 15 m in size were stopped by a ditch and an earthen barrier after a run-out of 800 m. An unstable overhanging ∼ 2600 m 3 compartment remained attached to the cliff and was blasted on 13 December 2011. During this artificially triggered event, 7 blocks reached the same ditch, with volumes ranging from 0.8 to 12 m 3 . A semi-permanent seismic array located about 2.5 km from the site recorded the two events, providing a unique opportunity to understand and to compare the seismic phases generated during natural and artificially triggered rockfalls. Both events have signal duration of ∼ 100 s with comparable maximum amplitudes recorded at large distances (computed local magnitude of 1.14 and 1.05, respectively), most of the energy lying below 20 Hz. Remote sensing techniques (photogrammetry and lidar) were employed before and after the provoked rockfall, allowing the volume and fracturing to be characterized. This event was filmed by two video cameras, and the generated ground motions were recorded using two temporary 3C seismic sensors and three seismic arrays deployed at the slope toe.Videos and seismogram processing provided estimates of the propagation velocity during the successive rockfall phases, which ranges from 12 to 30 m s −1 . The main seismic phases were obtained from combined video and seismic signal analyses. The two most energetic phases are related to the ground impact of fallen material after free fall, and to individual rock block impacts into the ditch and the earthen barrier. These two phases are characterized by similar lowfrequency content but show very different particle motions. The discrete element technique allowed reproducing the key features of the rockfall dynamics, yielding propagation velocities compatible with experimental observations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Seismic and mechanical studies of the artificially triggered rockfall at Mount Néron (French Alps, December 2011)

Bottelin

Jongmans

Daudon

et al. 2014

Nat. Hazards Earth Syst. Sci.

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“…In fact, it is known that landslides generate seismic signals, "landquakes", which contain a specific signature: low-frequency waves released by the bedrock when the mass detaches, and high-frequency waves produced by the landslide mass while it is sliding, peaking when it impacts the deposition area (e.g. Yamada et al, 2012;Chen et al, 2013). If analysed separately, they can give information on both landslide initiation and impact (Fig.…”

Section: Open Discussion: the Lesson Of A Killer Landslidementioning

confidence: 99%

Brief communication: Post-seismic landslides, the tough lesson of a catastrophe

Fan

Scaringi

2018

Nat. Hazards Earth Syst. Sci.

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Abstract. The rock avalanche that destroyed the village of Xinmo in Sichuan, China, on 24 June 2017, brought the issue of landslide risk and disaster chain management in highly seismic regions back into the spotlight. The long-term postseismic behaviour of mountain slopes is complex and hardly predictable. Nevertheless, the integrated use of field monitoring, remote sensing and real-time predictive modelling can help to set up effective early warning systems, provide timely alarms, optimize rescue operations, and perform secondary hazard assessments. We believe that a comprehensive discussion on post-seismic slope stability and on its implications for policy makers can no longer be postponed.

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“…The landslide we simulate was caused by a typhoon passing over the Kii peninsula in southwest Japan on September 4, 2011. In our simulation, we use the source location (longitude, latitude = 135.715°, 34.133°) described by YAMADA et al (2012) and the source time function derived from the waveform inversion conducted by YAMADA et al (2013). The locations of the landslide and the stations used in our simulation are presented in Fig.…”

Section: Source Model Used In Simulationsmentioning

confidence: 99%

“…1b; this map was created using topography data obtained from a 5 m mesh provided by the Geospatial Information Authority of Japan (GSI). CHIGIRA et al YAMADA et al 2012YAMADA et al , 2013. We extract the part representing the appropriate duration from their original function data and apply a cosine taper of 5 s to the beginning and end to produce a smooth function.…”

Section: Source Model Used In Simulationsmentioning

confidence: 99%

Seismic Wavefields in the Deep Seafloor Area from a Submarine Landslide Source

Nakamura

Takenaka

Okamoto

et al. 2013

Pure Appl. Geophys.

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Abstract-We use the finite difference method to simulate seismic wavefields at broadband land and seafloor stations for a given terrestrial landslide source, where the seafloor stations are located at water depths of 1,900-4,300 m. Our simulation results for the landslide source explain observations well at the seafloor stations for a frequency range of 0.05-0.1 Hz. Assuming the epicenter to be located in the vicinity of a large submarine slump, we also model wavefields at the stations for a submarine landslide source. We detect propagation of the Airy phase with an apparent velocity of 0.7 km/s in association with the seawater layer and an accretionary prism for the vertical component of waveforms at the seafloor stations. This later phase is not detected when the structural model does not consider seawater. For the model incorporating the seawater, the amplitude of the vertical component at seafloor stations can be up to four times that for the model that excludes seawater; we attribute this to the effects of the seawater layer on the wavefields. We also find that the amplification of the waveform depends not only on the presence of the seawater layer but also on the thickness of the accretionary prism, indicating low amplitudes at the land stations and at seafloor stations located near the trough but high amplitudes at other stations, particularly those located above the thick prism off the trough. Ignoring these characteristic structures in the oceanic area and simply calculating the wavefields using the same structural model used for land areas would result in erroneous estimates of the size of the submarine landslide and the mechanisms underlying its generation. Our results highlight the importance of adopting a structural model that incorporates the 3D accretionary prism and seawater layer into the simulation in order to precisely evaluate seismic wavefields in seafloor areas.

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Seismic recordings of landslides caused by Typhoon Talas (2011), Japan

Cited by 93 publications

References 15 publications

Seismic and mechanical studies of the artificially triggered rockfall at Mount Néron (French Alps, December 2011)

Seismic and mechanical studies of the artificially triggered rockfall at Mount Néron (French Alps, December 2011)

Brief communication: Post-seismic landslides, the tough lesson of a catastrophe

Seismic Wavefields in the Deep Seafloor Area from a Submarine Landslide Source

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