Continuing inflation at Three Sisters volcanic center, central Oregon Cascade Range, USA, from GPS, leveling, and InSAR observations

Dzurisin, Daniel; Lisowski, M.; Wicks, Charles W.

doi:10.1007/s00445-009-0296-4

Cited by 62 publications

(81 citation statements)

References 48 publications

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“…For instance, a sudden pressure increase in a reservoir surrounded by a viscoelastic shell in an elastic medium induces instantaneous displacement, followed by continuous displacement with a decreasing rate, following an exponential law [Dragoni and Magnanensi, 1989]. As explained by Dzurisin et al [2009], a shallow reservoir embedded in an elastic medium and fed by a constant pressure source through a hydraulic connection, and a sudden pressure increase in a reservoir surrounded by a viscous shell can both equally well explain exponential decay of the inflation rate. Also, thermo-poro-elastic models have been developed to understand hydrothermal systems, and they have shown that fluid injection at a constant rate can also induce surface displacement that is characterized by short-term exponential behavior followed by a linear trend [Fournier and Chardot, 2012].…”

Section: Discussionmentioning

confidence: 99%

A two‐magma chamber model as a source of deformation at Grímsvötn Volcano, Iceland

et al. 2014

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Grímsvötn Volcano is the most active volcano in Iceland, and its last three eruptions were in 1998, 2004, and 2011. Here we analyze the displacement around Grímsvötn during these last three eruptive cycles using 10 GPS stations. The observed displacements in this region generally contain a linear component of tectonic and glacio‐isostatic origin, in agreement with the previously estimated values of plate motions and vertical rebound. Larger amplitude deformation observed close to Grímsvötn at the GFUM continuous GPS station clearly reflects a major volcanic contribution superimposed on a tectonic component. We estimate and subtract the tectonic trend at this station using regional observed displacement. The direction and pattern of the residual volcanic displacement (for coeruptive and intereruptive periods) are consistent for all three of these eruptive cycles. The posteruptive inflation is characterized by an exponential trend, followed by a linear trend. In this study, we explain this temporal behavior using a new analytic model that has two connected magma chambers surrounded by an elastic medium and fed by a constant basal magma inflow. During the early posteruptive phase, pressure readjustment occurs between the two reservoirs, with replenishment of the shallow chamber from the deep chamber. Afterward, due to the constant inflow of magma into the deep reservoir, the pressurization of the system produces linear uplift. A large deep reservoir favors magma storage rather than surface emission. Based on displacement measured at GFUM station, we estimate an upper limit for the radius of the deep reservoir of ∼10 km.

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Section: Discussionmentioning

confidence: 99%

A two‐magma chamber model as a source of deformation at Grímsvötn Volcano, Iceland

et al. 2014

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“…The magnitude of completeness is unknown for this catalog, but given the distribution of PNSN stations at Three Sisters (six stations within a 25 km radius), it is probably not significantly greater than the magnitude of completeness at Uturuncu. The last eruption of South Sister volcano occurred at ∼1.5 ka (Dzurisin et al 2009). Uturuncu and South Sister are similar in that they both exhibit uplift rates on the order of cm/year despite long periods of dormancy, yet Uturuncu is significantly more seismically active.…”

Section: Global Contextmentioning

confidence: 98%

“…In the Oregon Cascades, uplift of a broad region centered 5 km west of South Sister volcano has been going on since 1997, with uplift rates measured by InSAR of 3-5 cm/year from 1998 to 2001and ∼1.4 cm/year from 2004(Dzurisin et al 2009). An earthquake swarm of 300 VT earthquakes with an average magnitude of ∼1.9 occurred in this deforming region on 23-25 March 2004(Venzke et al 2002.…”

Section: Global Contextmentioning

confidence: 98%

Shallow seismicity, triggered seismicity, and ambient noise tomography at the long-dormant Uturuncu Volcano, Bolivia

et al. 2011

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Using a network of 15 seismometers around the inflating Uturuncu Volcano from April 2009 to 2010, we find an average rate of about three local volcano-tectonic earthquakes per day, and swarms of 5-60 events a few times per month with local magnitudes ranging from −1.2 to 3.7. The earthquake depths are near sea level, more than 10 km above the geodetically inferred inflation source and the Altiplano Puna Magma Body. The Mw 8.8 Maule earthquake on 27 February 2010 triggered hundreds of earthquakes at Uturuncu with the onset of the Love and Rayleigh waves and again with the passage of the X2/X3 overtone phases of Rayleigh waves. This is one of the first incidences in which triggering has been observed from multiple surface wave trains. The earthquakes are oriented NW-SE similar to the regional faults and lineaments. The b value of the catalog is 0.49, consistent with a tectonic origin of the earthquakes. We perform ambient noise tomography using Love wave cross-correlations to image a low-velocity zone at 1.9 to 3.9 km depth below the surface centered slightly north of the summit. The low velocities are perhaps related to the hydrothermal system and the low-velocity zone is spatially correlated with earthquake locations. The earthquake rate appears to vary with time-a seismic deployment from 1996 to 1997 reveals 1-5 earthquakes per day, whereas 60 events/day were seen during 5 days using one seismometer in 2003. However, differences in analysis methods and magnitudes of completeness do not allow direct comparison of these seismicity rates. The rate of seismic activity at Uturuncu is higher than at other wellmonitored inflating volcanoes during periods of repose. The frequent swarms and triggered earthquakes suggest the hydrothermal system is metastable.

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“…Remarkably, the uplifting was not accompa nied by seismic activation at the level of sensitivity of the Kamchatka regional seismic network. This is not quite typical, although the practice of the volcanolog ical studies has the examples of aseismic evolution of the similar deformation processes in the present day volcanic areas (Dzurisin et al, 2009;Lu et al, 2000;2002). Lundgren and Lu (2006) studied the probable con figuration of the deep intrusion that caused the observed surface deformation.…”

Section: Characteristic Of the Regionmentioning

confidence: 95%

The model of the Uzon-Geizernaya volcano-tectonic depression and Kikhpinych volcano, Kamchatka, from the joint analysis of microseismic sounding data and local geodynamic activity

Kugaenko

Салтыков

Горбатиков

et al. 2015

Izv., Phys. Solid Earth

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The model of the magmatic system beneath the Uzon-Geizernaya volcano tectonic depression and adjacent Kikhpinych volcano in Kamchatka is constructed to a depth of 30 km based on the microseismic sounding data. For doing this, measurements of the natural microseismic field by the Guralp CMG 6TD portable broadband seismometer were carried out at 60 points along three profiles with a total length of about 28 km. The revealed structural heterogeneities were interpreted in the common context with the previous geological, geological morphological, and petrological results. The area of a shallow crystallized magmatic reservoir is identified and spatially localized below the depression. The zones of the presumed concentration of the basaltic melts probably responsible for the local geodynamic activation of the region during the past 15 years are revealed as the peripheral magmatic chamber of the Kikhpinych volcano at a depth of 5-12 km and a deeper (15-20 km) magma storage. The geometry of the identified deep structures is consistent with the local microseismicity and the model of the contemporary magmatic intrusion into the upper crustal layers, which is based on the data of satellite interferometry.

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Continuing inflation at Three Sisters volcanic center, central Oregon Cascade Range, USA, from GPS, leveling, and InSAR observations

Cited by 62 publications

References 48 publications

A two‐magma chamber model as a source of deformation at Grímsvötn Volcano, Iceland

A two‐magma chamber model as a source of deformation at Grímsvötn Volcano, Iceland

Shallow seismicity, triggered seismicity, and ambient noise tomography at the long-dormant Uturuncu Volcano, Bolivia

The model of the Uzon-Geizernaya volcano-tectonic depression and Kikhpinych volcano, Kamchatka, from the joint analysis of microseismic sounding data and local geodynamic activity

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