scholarly journals Mechanisms of step-like tilt changes and very long period seismic signals during the 2000 Miyakejima eruption: Insights from kinematic GPS

2016 ◽  
Vol 121 (4) ◽  
pp. 2932-2946 ◽  
Author(s):  
Hiroshi Munekane ◽  
Jun Oikawa ◽  
Tomokazu Kobayashi
Keyword(s):  
Seismic Signals ◽  
Kinematic Gps ◽  
Long Period

scholarly journals Variation patterns of landslide basal friction revealed from long-period seismic waveform inversion

2019 ◽  
Vol 100 (1) ◽  
pp. 313-327
Author(s):  
Dan Yu ◽  
Xinghui Huang ◽  
Zhengyuan Li
Keyword(s):  
Steady State ◽  
Friction Coefficient ◽  
Water Waves ◽  
Waveform Inversion ◽  
Time History ◽  
Seismic Signals ◽  
Long Period ◽  
Basal Friction ◽  
Seismic Waveform ◽  
Variation Patterns

Abstract A catastrophic landslide struck the Xiaoba village in Fuquan, Guizhou, southwestern China at about 8:30 p.m. (Beijing Time, UTC + 8) on August 27, 2014. The landslide and induced impulse water waves destroyed two villages and killed 23 persons. By reprocessing seismic signals from a seismic network deployed in the surrounding area of the landslide, we recognized the event from low-frequency seismic signals and subsequently performed a long-period seismic waveform inversion to obtain its force–time history. The inversion results reveal that the maximum force for the landslide is 5 × 109 N, and the duration of the landslide is 38.4 s. The landslide reached its maximum velocity of 12.4 m/s at 13.2 s after its initiation, and the mass center plugged into the quarry at 24.2 s. Based on the inversion results, we estimated basal friction of the landslide. We found the friction coefficient rapidly reduces to a relatively steady-state value of ~ 0.4 at a steady-state distance of 35 m and subsequently reduces in a near-linear manner that satisfies the empirical formula $$ \mu = - 1.4d + 0.44 $$μ=-1.4d+0.44, where $$ d $$d is sliding distance in km. The reduction in friction revealed by the formula is compatible with the finding of previous studies for landslides of similar volume in landslide acceleration stage. However, our result does not make it possible for the friction coefficient to increase again in landslide deceleration stage that a velocity-dependent friction law would allow. The friction variation patterns can be used to constrain input parameters in numerical landslide simulation, which can predicate runout distance and deposit areas for massive landslides to carry out landslide hazard assessment.

Broadband recording of Strombolian explosions and associated very-long-period seismic signals on Mount Erebus Volcano, Ross Island, Antarctica

1998 ◽  
Vol 25 (13) ◽  
pp. 2297-2300 ◽  
Author(s):  
C. A. Rowe ◽  
R. C. Aster ◽  
P. R. Kyle ◽  
J. W. Schlue ◽  
R. R. Dibble
Keyword(s):  
Seismic Signals ◽  
Long Period ◽  
Mount Erebus ◽  
Erebus Volcano ◽  
Strombolian Explosions

Moment tensor inversion of very long period seismic signals from Strombolian eruptions of Erebus Volcano

2008 ◽  
Vol 177 (3) ◽  
pp. 635-647 ◽  
Author(s):  
R. Aster ◽  
D. Zandomeneghi ◽  
S. Mah ◽  
S. McNamara ◽  
D.B. Henderson ◽  
...  
Keyword(s):  
Moment Tensor ◽  
Moment Tensor Inversion ◽  
Seismic Signals ◽  
Long Period ◽  
Strombolian Eruptions ◽  
Erebus Volcano
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