Migration of tremor locations before the 2008 eruption of Meakandake Volcano, Hokkaido, Japan

Ogiso, Masashi; Yomogida, Kiyoshi

doi:10.1016/j.jvolgeores.2011.12.005

Cited by 36 publications

(33 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The orange-colored side of the rectangle indicates the upper edge of the dike selection of P and S arrivals and confirmed that a similar location shift appeared when they applied the same analysis to VT earthquakes estimated below the PonMachineshiri crater (Figure 8 in Ogiso and Yomogita 2012). In light of this location shift, the source location of the volcanic tremor on November 16 shown in Figure 15 in Ogiso and Yomogita (2012) can be regarded as close to the Pon-Machineshiri crater, which is the assumed location of the centroid of the dike in this study.…”

Section: Resultsmentioning

confidence: 90%

“…They used the method developed by Battaglia and Aki (2003) and Kumagai et al (2010) to analyze three tremors occurring on September 29, November 16, and November 17-19. According to their results, despite the site amplification correction using coda waves of local earthquakes, the estimated locations of the tremor sources were shifted southward about 1 km from the summit rather than appearing just below the Pon-Machineshiri crater (e.g., Figure 15 in Ogiso and Yomogita 2012). They examined the shift by using the dataset of volcano tectonic (VT) earthquakes that are routinely analyzed by manual The centroid of the dike is fixed below the Akanuma crater, which is the central crater of the Pon-Machineshiri crater area.…”

Section: Resultsmentioning

confidence: 99%

“…This fact also suggests the existence of hydrothermal structures at this location. Ogiso and Yomogita (2012) attempted to estimate the source location of the precursory tremors of the 2008 activity by using the spatial distribution of seismic amplitudes recorded at short-period seismic stations of JMA Sapporo. They used the method developed by Battaglia and Aki (2003) and Kumagai et al (2010) to analyze three tremors occurring on September 29, November 16, and November 17-19.…”

Section: Resultsmentioning

confidence: 99%

“…According to temporal changes in seismic amplitude ratio among JMA stations, Ogiso and Yomogita (2012) divided the November 16 tremor into three phases. Phase 1 includes the first 4 min from the beginning of the tremor (0:57-1:01 JST).…”

Section: Resultsmentioning

confidence: 99%

“…The tilt change in this study began around 0:59 JST and continued for about 3 min, corresponding to the transition between phases 1 and 2. During this transition, Ogiso and Yomogita (2012) estimated a change in source depth to the deeper part. However, we were unable to find an evident phase to reflect the transition in the tilt records.…”

Section: Resultsmentioning

confidence: 99%

See 4 more Smart Citations

Precursory tilt changes of small phreatic eruptions of Meakan-dake volcano, Hokkaido, Japan, in November 2008

Aoyama

Oshima

2015

Earth Planet Sp

View full text Add to dashboard Cite

Although forecasting an occurrence of phreatic eruption is very difficult, it has been reported that some precursory activities often precede these eruptions at several volcanoes. In this study, we observed seismic activities before and during the 2008 phreatic eruption at Meakan-dake volcano, eastern Hokkaido, Japan, by using broadband seismometers and surface mount-type tiltmeters. The precursory increase in seismicity began in late September about 2 months before the first eruption on November 18. After several rises and falls in seismicity in October and in early November, a small volcanic tremor was observed early on November 16. Although the original velocity seismogram of the tremor generally appeared to be spindle shaped, an outstanding ramp function appeared in the displacement seismogram obtained by simple integration. Since the ramp function appeared only in the horizontal components and continued for about 3 min, which is sufficiently longer than the natural period of the seismometer, we regarded the ramp function as an expression of the tilting motions of seismic stations that was quantitatively confirmed by the strong similarity between horizontal displacement seismograms and tilt data from co-located biaxial tiltmeter. Azimuthal distribution of three tilting vectors obtained from broadband seismograms was not consistent with a simple spherical source but rather strongly suggested a vertical dike under the crater. In this study, we confirmed that an almost vertical single dike effectively explains the observed tilting vectors. The estimated volume increase in the dike was 4-5 × 10 4 m 3 . The strike direction of the dike is highly consistent with the alignment of the hydrothermal area on and around the volcano. Our dike model also partially explains the changes in global navigation satellite system (GNSS) measurement and in groundwater levels reported in previous research. Since a similar deformation coincided with a volcanic tremor preceding the 2006 eruption, we interpret that this must be an important preparatory process of phreatic eruptions at Meakan-dake volcano.

show abstract

Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Precursory tilt changes of small phreatic eruptions of Meakan-dake volcano, Hokkaido, Japan, in November 2008

Aoyama

Oshima

2015

Earth Planet Sp

View full text Add to dashboard Cite

show abstract

Two types of volcanic tremor changed with eruption style during 1986 Izu‐Oshima eruption

2016

View full text Add to dashboard Cite

Volcanic tremor provides clues to magma migration pathways so that tremor source location is expected to be an efficient tool for tracking dynamic behavior of magma in evolution of eruptive activity. However, clear evidence, which connects between temporal variation in volcanic tremor and evolution of eruption style, is still lacking. We have analyzed volcanic tremors occurred during 1986 Izu‐Oshima eruption using recently digitized data. The results present a clear link between eruption styles, waveform variations and source locations of the tremors. Moreover, precursory activity of the tremors that indicates injection of magma below fissures has been clarified 5 days prior to the fissure eruptions. This demonstrates predominance of tremor activity as an adaptive monitoring tool in volcanic eruption.

show abstract

Calibrating the amplitude source location (ASL) method by using active seismic sources: An example from Te Maari volcano, Tongariro National Park, New Zealand

Walsh

Jolly

Procter

2017

Geophysical Research Letters

View full text Add to dashboard Cite

A frequently applied amplitude source location (ASL) method is here calibrated and optimized by using active seismic sources located at the surface of a dry stream channel. The ASL produced location discrepancies larger than 1.0 km laterally and 500 m in depth by using independently determined velocity model, attenuation, and site amplification factors (AFs). Sensitivity tests for ASL input parameters show that attenuation and velocity have moderate influence on the location but are easy to independently constrain. AFs are shown to strongly influence the location, and their application may introduce substantial location uncertainties. Model uncertainties are accommodated with either lateral or depth changes depending on the input parameters, station corrections, and the source‐station geometry.

show abstract

Migration of tremor locations before the 2008 eruption of Meakandake Volcano, Hokkaido, Japan

Abstract: 7We estimate the locations of three tremor sequences, denoted A, B, and

Cited by 36 publications

References 9 publications

Precursory tilt changes of small phreatic eruptions of Meakan-dake volcano, Hokkaido, Japan, in November 2008

Precursory tilt changes of small phreatic eruptions of Meakan-dake volcano, Hokkaido, Japan, in November 2008

Two types of volcanic tremor changed with eruption style during 1986 Izu‐Oshima eruption

Calibrating the amplitude source location (ASL) method by using active seismic sources: An example from Te Maari volcano, Tongariro National Park, New Zealand

Contact Info

Product

Resources

About