Abstract
The edifice of a volcano is a unique deformational environment, dependent not just on active volcanic processes but also on its composition, structure, and morphology. We measured the deformation of Volcn Arenal, Costa Rica, using interferograms constructed from both ALOS and RadarSat data between 2005 and 2009. The volcano's western flanks are moving downslope at an angle of ∼55° below the horizontal plane and a consistent rate of at least ∼7 cm/yr. We use the pattern, rate, and direction of motion to test several hypotheses for its origin. Our favored explanation is creep along a shallow sliding plane, most likely the interface between deposits postdating the 1968 lateral blast eruption and the older lavas and paleosoils beneath. Our measurement of slope movement adds to a small set of rate measurements for gravity-driven deformation at volcanoes and is distinctive in both its relatively high rate and shallow origin. Observation of deformation at Arenal contributes both to the assessment of particular hazards around Arenal itself and, more generally, to the study of the stability of young stratovolcanoes.
| Original language | English (US) |
|---|---|
| Article number | Q12004 |
| Journal | Geochemistry, Geophysics, Geosystems |
| Volume | 11 |
| Issue number | 12 |
| DOIs | |
| State | Published - 2010 |
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Keywords
- Arenal
- deformation
- InSAR
- volcano
ASJC Scopus subject areas
- Geochemistry and Petrology
- Geophysics
Cite this
Steady downslope movement on the western flank of Arenal volcano, Costa Rica. / Ebmeier, S. K.; Biggs, J.; Mather, T. A.; Wadge, G.; Amelung, Falk C.
In: Geochemistry, Geophysics, Geosystems, Vol. 11, No. 12, Q12004, 2010.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Steady downslope movement on the western flank of Arenal volcano, Costa Rica
AU - Ebmeier, S. K.
AU - Biggs, J.
AU - Mather, T. A.
AU - Wadge, G.
AU - Amelung, Falk C
PY - 2010
Y1 - 2010
N2 - The edifice of a volcano is a unique deformational environment, dependent not just on active volcanic processes but also on its composition, structure, and morphology. We measured the deformation of Volcn Arenal, Costa Rica, using interferograms constructed from both ALOS and RadarSat data between 2005 and 2009. The volcano's western flanks are moving downslope at an angle of ∼55° below the horizontal plane and a consistent rate of at least ∼7 cm/yr. We use the pattern, rate, and direction of motion to test several hypotheses for its origin. Our favored explanation is creep along a shallow sliding plane, most likely the interface between deposits postdating the 1968 lateral blast eruption and the older lavas and paleosoils beneath. Our measurement of slope movement adds to a small set of rate measurements for gravity-driven deformation at volcanoes and is distinctive in both its relatively high rate and shallow origin. Observation of deformation at Arenal contributes both to the assessment of particular hazards around Arenal itself and, more generally, to the study of the stability of young stratovolcanoes.
AB - The edifice of a volcano is a unique deformational environment, dependent not just on active volcanic processes but also on its composition, structure, and morphology. We measured the deformation of Volcn Arenal, Costa Rica, using interferograms constructed from both ALOS and RadarSat data between 2005 and 2009. The volcano's western flanks are moving downslope at an angle of ∼55° below the horizontal plane and a consistent rate of at least ∼7 cm/yr. We use the pattern, rate, and direction of motion to test several hypotheses for its origin. Our favored explanation is creep along a shallow sliding plane, most likely the interface between deposits postdating the 1968 lateral blast eruption and the older lavas and paleosoils beneath. Our measurement of slope movement adds to a small set of rate measurements for gravity-driven deformation at volcanoes and is distinctive in both its relatively high rate and shallow origin. Observation of deformation at Arenal contributes both to the assessment of particular hazards around Arenal itself and, more generally, to the study of the stability of young stratovolcanoes.
KW - Arenal
KW - deformation
KW - InSAR
KW - volcano
UR - http://www.scopus.com/inward/record.url?scp=78650299670&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=78650299670&partnerID=8YFLogxK
U2 - 10.1029/2010GC003263
DO - 10.1029/2010GC003263
M3 - Article
AN - SCOPUS:78650299670
VL - 11
JO - Geochemistry, Geophysics, Geosystems
JF - Geochemistry, Geophysics, Geosystems
SN - 1525-2027
IS - 12
M1 - Q12004
ER -