Self-potential and ground temperature at Merapi volcano prior to its crisis in the rainy season of 2000–2001

Friedel, S.; Byrdina, Svetlana; Jacobs, Franz; Zimmer, Martin

doi:10.1016/j.jvolgeores.2004.01.006

Cited by 27 publications

(30 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The summit region is mainly composed of imbricate lava domes, crater rims and pyroclastic deposits, locally highly altered. Soil temperature in this zone, as well as on the upper ESE slope of the crater, can reach more than 60°C (Friedel et al 2004), thus outlining diffuse degassing.…”

Section: Merapi Volcanic and Degassing Activitymentioning

confidence: 92%

Structure and CO2 budget of Merapi volcano during inter-eruptive periods

Toutain

Sortino

Baubron³

et al. 2009

Bull Volcanol

View full text Add to dashboard Cite

Soil temperature and gas (CO 2 concentration and flux) have been investigated at Merapi volcano (Indonesia) during two inter-eruptive periods (2002 and 2007). Precise imaging of the summit crater and the spatial pattern of diffuse degassing along a gas traverse on the southern slope are interpreted in terms of summit structure and major caldera organization. The summit area is characterized by decreasing CO 2 concentrations with distance from the 1932 crater rim, down to atmospheric levels at the base of the terminal cone. Similar patterns are measured on any transect down the slopes of the cone. The spatial distribution of soil gas anomalies suggests that soil degassing is controlled by structures identified as concentric historical caldera rims (1932, 1872, and 1768), which have undergone severe hydrothermal self-sealing processes that dramatically lower the permeability and porosity of soils. Temperature and CO 2 flux measurements in soils near the dome display heterogeneous distributions which are consistent with a fracture network identified by previous geophysical studies. These data support the idea that the summit is made of isolated and mobile blocks, whose boundaries are either sealed by depositional processes or Bull Volcanol (2009) 71:815-826

show abstract

Section: Merapi Volcanic and Degassing Activitymentioning

confidence: 92%

Structure and CO2 budget of Merapi volcano during inter-eruptive periods

Toutain

Sortino

Baubron³

et al. 2009

Bull Volcanol

View full text Add to dashboard Cite

show abstract

“…However, we should also consider other mechanisms for transient effects related to fluid disruption or seismicity (Byrdina et al 2003;Johnston et al 2001). The amplitude of SP anomalies can be up to several hundreds of millivolts Delmelle et al 1998) over distances of 1 km (Ballestracci and Nishida 1987;Di Maio et al 1996;Finizola et al 2004;Friedel et al 2004;Hashimoto and Tanaka, 1995;Lewicki et al 2003a;Sasai et al 1997;Zlotnicki et al 1998). …”

Section: Methodsmentioning

confidence: 99%

Combined electromagnetic, geochemical and thermal surveys of Taal volcano (Philippines) during the period 2005–2006

et al. 2008

View full text Add to dashboard Cite

show abstract

“…Wavelet techniques have been used rather widely to determine the source current distribution from SP mapping surveys (e.g., Gibert and Pessel, 2001;Saracco et al, 2004), but not for monitoring purposes. In one of the rare wavelet applications to SP monitoring data, Friedel et al (2004) analyzed data acquired at Merapi Volcano, Indonesia and found that many of the observed anomalies were associated with precipitation events.…”

Section: Waveletsmentioning

confidence: 99%

“…SP data could then be used to evaluate, by comparing the data with those acquired at neighboring unrestored sites, the effect of river restoration on hydrological subsurface processes. Another more general motivation is that better understanding of near-surface SP sources can help to remove SP signals of shallow origin when investigating deeper phenomena, such as, volcanic activity (Friedel et al, 2004), earthquake precursors (Park, 1983), or processing magnetotelluric data (Perrier and Morat, 2000).…”

Section: Introductionmentioning

confidence: 99%

Self-potential investigations of a gravel bar in a restored river corridor

Linde

Doetsch

Jougnot

et al. 2011

Hydrol. Earth Syst. Sci.

View full text Add to dashboard Cite

Abstract. Self-potentials (SP) are sensitive to water fluxes and concentration gradients in both saturated and unsaturated geological media, but quantitative interpretations of SP field data may often be hindered by the superposition of different source contributions and time-varying electrode potentials. Self-potential mapping and close to two months of SP monitoring on a gravel bar were performed to investigate the origins of SP signals at a restored river section of the Thur River in northeastern Switzerland. The SP mapping and subsequent inversion of the data indicate that the SP sources are mainly located in the upper few meters in regions of soil cover rather than bare gravel. Wavelet analyses of the timeseries indicate a strong, but non-linear influence of water table and water content variations, as well as rainfall intensity on the recorded SP signals. Modeling of the SP response with respect to an increase in the water table elevation and precipitation indicate that the distribution of soil properties in the vadose zone has a very strong influence. We conclude that the observed SP responses on the gravel bar are more complicated than previously proposed semi-empiric relationships between SP signals and hydraulic head or the thickness of the vadose zone. We suggest that future SP monitoring in restored river corridors should either focus on quantifying vadose zone processes by installing vertical profiles of closely spaced SP electrodes or by installing the electrodes within the river to avoid signals arising from vadose zone processes and time-varying electrochemical conditions in the vicinity of the electrodes.Correspondence to: N. Linde

show abstract

Self-potential and ground temperature at Merapi volcano prior to its crisis in the rainy season of 2000–2001

Cited by 27 publications

References 38 publications

Structure and CO2 budget of Merapi volcano during inter-eruptive periods

Structure and CO2 budget of Merapi volcano during inter-eruptive periods

Combined electromagnetic, geochemical and thermal surveys of Taal volcano (Philippines) during the period 2005–2006

Self-potential investigations of a gravel bar in a restored river corridor

Contact Info

Product

Resources

About