scholarly journals Crustal deformations associated with the great Sumatra-Andaman earthquake deduced from continuous GPS observation

2006 ◽  
Vol 58 (2) ◽  
pp. 127-139 ◽  
Author(s):  
Manabu Hashimoto ◽  
Nithiwatthn Choosakul ◽  
Michio Hashizume ◽  
Shuzo Takemoto ◽  
Hiroshi Takiguchi ◽  
...  
Keyword(s):  
Gps Observation ◽  
Continuous Gps ◽  
Andaman Earthquake

scholarly journals Methods for Eruption Prediction and Hazard Evaluation at Indonesian Volcanoes

2012 ◽  
Vol 7 (1) ◽  
pp. 26-36 ◽  
Author(s):  
Masato Iguchi ◽  
◽  
Surono ◽  
Takeshi Nishimura ◽  
Muhamad Hendrasto ◽  
...  
Keyword(s):  
Volcanic Activity ◽  
Hazard Evaluation ◽  
Seismic Amplitude ◽  
Geological Surveys ◽  
Cumulative Volume ◽  
Background Data ◽  
Tectonic Earthquakes ◽  
Gps Observation ◽  
Continuous Gps ◽  
Eruptive Rate

We report methods, based on geophysical observations and geological surveys, for the prediction of eruptions and the evaluation of the activity of 4 volcanoes in Indonesia. These are Semeru, Guntur, Kelud and Sinabung volcanoes. Minor increases in tilt were detected by borehole tiltmeters prior to eruptions at the Semeru volcano depending on the seismic amplitude of explosion earthquakes. The results show the possibility of prediction of the type and magnitude of eruption and the effectiveness of observation with a high signalto-noise ratio. The establishment of background data is important for evaluating volcanic activity in longterm prediction. Typical distributions of volcanic and local tectonic earthquakes were obtained around the Guntur volcano, where geodetic monitoring by continuous GPS observation is valuable. The cumulative volume of eruptive products is valuable for evaluating the potential for future eruption. The eruptive rate of the Kelud volcano is ca 2×106m3/y (dense rock equivalent), but the volume of the 2007 eruption was only 2×107m3, suggesting a still high potential for eruption. Based on geological surveys and dating, an eruption scenario is proposed for the activity of Mt. Sinabung, where phreatic eruptions occurred in 2010 after a historically long dormancy.

Ground Deformation of Mayon Volcano Revealed by GPS Campaign Survey

2015 ◽  
Vol 10 (1) ◽  
pp. 106-112
Author(s):  
Akimichi Takagi ◽  
◽  
Kenji Fujiwara ◽  
Takahiro Ohkura ◽  
Artemio C. Luis ◽  
...  
Keyword(s):  
Volume Change ◽  
Ground Deformation ◽  
Source Parameters ◽  
Pressure Source ◽  
Mayon Volcano ◽  
Observation Network ◽  
Preparation Stage ◽  
Gps Observation ◽  
Continuous Gps ◽  
Do So

Determining the location and the amount of volume change of the pressure source beneath a volcano during the eruption preparation stage is an important issue in monitoring the magma accumulation. To do so, we have implemented a GPS campaign survey network around the Mayon volcano and monitored ground deformation since 2005. Rapid grounddeflating deformation was detected accompanied by the 2009 eruption. The Mogi model pressure source was estimated to be 8.5 km deep beneath the summit and the amount of volume change –13 × 106 m3. In magma accumulation preceding the 2009 eruption, ground deformation showed a weak inflationary trend, but it was difficult to evaluate the source parameters definitively. After the 2009 eruption, no deformation has been detected by the Continuous GPS observation network since 2012. Trend of many baselines of continuous and campaign network turned to extension since 2014. Magma may have started accumulating beneath the Mayon volcano.

A RHEOLOGICAL MODEL OF POST-SEISMIC RESPONSE DUE TO 2004 SUMATRA-ANDAMAN EARTHQUAKE: CONTRIBUTION FROM LOW VISCOSITY LITHOSPHERE

2009 ◽  
Vol 03 (01) ◽  
pp. 25-34 ◽  
Author(s):  
C. D. REDDY ◽  
SANJAY K. PRAJAPATI ◽  
TERUYUKI KATO
Keyword(s):  
Seismic Response ◽  
Crustal Deformation ◽  
Upper Mantle ◽  
Far Field ◽  
Sumatra Earthquake ◽  
Low Viscosity ◽  
Viscoelastic Modeling ◽  
Seismic Deformation ◽  
Continuous Gps ◽  
Andaman Earthquake

The Sumatra earthquake on December 26, 2004 provided an excellent opportunity to investigate the post-seismic crustal deformation and thereby understand the rheology of the crust and mantle. Subsequent to this earthquake, we monitored the post-seismic deformation at strategically located five continuous GPS sites in Andaman and Nicobar region. The post-seismic transients are obtained and the viscoelastic modeling has been carried out. Post-seismic flow below a depth of 55–60 km with low viscosity of the order of 1019 Pa S can explain observed far field motion. There is also a contribution from upper mantle to post-seismic deformation which follows power law rheology. These results lead us to infer that the Sumatra-Andaman mechanical lithosphere is about at ~55 km depth.

scholarly journals A block-fault model for deformation of the Japanese Islands derived from continuous GPS observation

2000 ◽  
Vol 52 (11) ◽  
pp. 1095-1100 ◽  
Author(s):  
Manabu Hashimoto ◽  
Shin’ichi Miyazaki ◽  
David D. Jackson
Keyword(s):  
Fault Model ◽  
Gps Observation ◽  
Continuous Gps ◽  
Japanese Islands

scholarly journals Magma intrusion and effusion at Sinabung volcano, Indonesia, from 2013 to 2016, as revealed by continuous GPS observation

2019 ◽  
Vol 382 ◽  
pp. 173-183 ◽  
Author(s):  
Kohei Hotta ◽  
Masato Iguchi ◽  
Takahiro Ohkura ◽  
Muhamad Hendrasto ◽  
Hendra Gunawan ◽  
...  
Keyword(s):  
Magma Intrusion ◽  
Gps Observation ◽  
Continuous Gps
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