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Heather Wright

Research Geologist

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Short Biography

Currently working for Volcano Disaster Assistance Program of the USGS

USGS-related work: Timing and nature of volcanism/magmatism in the Salton Sea area, southern California

Previous Mendenhall postdoctoral research fellow: using crystal and glass compositions from eruptive products of Mt. Mazama (Crater Lake) volcano to examine magma chamber evolution processes; modelling this evolution through time using an integrated geochemical and thermodynamic approach.

Her research interests include: understanding the evolution of pore structure due to degassing in volcanic systems, examination of crystallization in response to decompression and degassing, and understanding evolution, recharge, and ascent processes in volcanic systems.



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Publications

Wright, H. M. and Cashman, K.V. 2014, Compaction and gas loss in welded pyroclastic deposits as revealed by porosity, permeability, and electrical conductivity measurements of the Shevlin Park Tuff, Geological Society of America Bulletin. 126: 234-247 doi: 10.1130/B30668.1 [Link]

Pardo, N., Cronin, S.J., Wright, H., Schipper, C.I., Smith, I., and Stewart, B., in press, Pyroclast textral variation as an indicator of eruption-column steadiness in andesitic Plinian eruptions at Mt. Ruapehu, Bull. Volcanol.

Wright, H.M.N., Cashman, K.V., Mothes, P.A., Hall, M.L., Ruiz, A.G., and Le Pennec, J.-L. 2012. Estimating rates of decompression from textures of erupted ash particles produced by 1999-2006 eruptions of Tungurahua Volcano, Ecuador. Geology. 7: 619-622 doi: 10.1130/G32948.1 [Link]

Wright, H.M., Bacon, C.R., Vazquez, J.A., and Sisson, T.W., 2012, Sixty-thousand years of magmatic volatile history before the caldera-forming eruption of Mount Mazama, Crater Lake, Oregon. Contributions to Mineralogy and Petrology doi: 10.1007/s00410-012-0787-8

Lesti, C., Porreca M., Giordano G., Mattei M., Cas R., Wright H., Viramonte J. 2011. High temperature emplacement of the Cerro Galán and Toconquis Group ignimbrites (Puna Plateau, NW Argentina) determined by TRM analyses. In Cas, R.A.F and Cashman, K.(eds) The Cerro Galán Ignimbrite and Caldera: characteristics and origins of a very large volume ignimbrite and its magma system. Bull. Volcanol. 73: 1535-1565 doi: 10.1007/s00445-011-0536-2

Cas, R.A.F., Wright, H.M.N., Folkes, C.B., Lesti, C., Porreca, M., Giordano, G., and Viramonte, J.G. 2011. The flow dynamics of an extremely large volume pyroclastic flow, the 2.08 Ma Cerro Galán Ignimbrite, NW Argentina, using deposit characteristics and contacts with basement topography at distal margins. In Cas, R.A.F and Cashman, K.(eds) The Cerro Galán Ignimbrite and Caldera: characteristics and origins of a very large volume ignimbrite and its magma system. Bull. Volcanol. 73: 1583-1609 doi. 10.1007/s00445-011-0564-y

Folkes, C.B., Wright, H.M, Cas, R.A.F., de Silva, S.L., Lesti, C., and Viramonte, J. 2011. A re-appraisal of the stratigraphy and volcanology of the Cerro Galán volcanic system, NW Argentina. In Cas, R.A.F and Cashman, K.(eds) The Cerro Galán Ignimbrite and Caldera: characteristics and origins of a very large volume ignimbrite and its magma system. Bull. Volcanol. 73: 1427-1454 doi:10.1007/849 s00445-011-0459-y

Folkes, C.B., de Silva, S., Wright, H.M., and Cas, R.A.F. 2011. Geochemical homogeneity of a long-lived large silicic system: evidence from Cerro Galan Caldera, NW Argentina. In Cas, R.A.F and Cashman, K.(eds) The Cerro Galán Ignimbrite and Caldera: characteristics and origins of a very large volume ignimbrite and its magma system. Bull. Volcanol. 73: 1455-1486 doi:10.1007/s00445-011-0511-y

Wright, H.M.N., Lesti, C., Cas, R.A.F., Porecca, M., Viramonte, J.G., Folkes, C. and Giordano, G. 2011. Columnar jointing in vapor phase altered, non-welded Cerro Galan Ignimbrite, Paycuqui, Argentina. In Cas, R.A.F and Cashman, K.(eds) The Cerro Galán Ignimbrite and Caldera: characteristics and origins of a very large volume ignimbrite and its magma system. Bull. Volcanol. 73: 1567-1582 doi: 10.1007/s00445-011-0524-6

Wright, H.M.N., Folkes, C.B., Cas, R.A.F, and Cashman, K.V. 2011. Heterogeneous pumice populations in the 2.08 Ma Cerro Galán Ignimbrite: implications for magma recharge and ascent preceding a large volume silicic eruption. In Cas, R.A.F and Cashman, K.(eds) The Cerro Galán Ignimbrite and Caldera: characteristics and origins of a very large volume ignimbrite and its magma system. Bull. Volcanol. 73:1513-1533 doi: 10.1007/s00445-011-0525-5 [Link]

Cabrera, A., Weinberg, R., Wright, H., and Vlotnik, S. 2010. Melt fracturing and healing: a mechanism for degassing and origin of obsidian. Geology, 39: 67-70. doi: 10.1130/G31355.1




Wright, H.M.N., Weinberg, R. 2009. Strain localization in vesicular magma: implications for rheology and fragmentation. Geology 37: 1023-1026. doi: 10.1130/G30199A.1

Wright, H.M.N., Cashman, K.V., Gottesfeld, E., and Roberts, J.J. 2009.  Pore structure of volcanic clasts: measurements of permeability and electrical conductivity. Earth and Planet. Sci. Lett. 280: 93-104.

Rust, A.C., Cashman, K.V., and Wright, H.M. 2008. Fudge factors in lessons on crystallization, rheology and morphology of basalt lava flows. Journal of Geoscience Education 56: 73-80

Wright, H.M.N., Cashman, K.V., Rosi, M., and Cioni, R. 2007. Breadcrust bombs as indicators of Vulcanian eruption dynamics at Guagua Pichincha volcano, Ecuador. Bull. Volcanol. 69: 281-300

Wright, H.M.N., Roberts, J.J., and Cashman, K.V. 2006. Permeability of anisotropic tube pumice: Model calculations and measurements. Geophys. Res. Lett. 33: L17316




                           

My Science Topics


Science Topic
Subtopic
Natural Hazardsvolcanoes
Natural Hazardsvolcanic activity



My USGS Science Strategy Areas

A National Hazard, Risk, and Resilience Assessment Program

Volcanology and petrology


Contact Information

Heather Wright
1300 SE Cardinal Court, Bldg. 10
Vancouver, WA 98683-9589
hwright@usgs.gov
360-993-8916
360-993-8980 - Fax
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