Julia Griswold
Volcano geologist working with the Volcano Disaster Assistance Program. Manages satellite remote sensing data to answer questions about the status of unrest at volcanoes around the world. Works as a project manager for the International Charter for Space and Major Disasters.
Education and Certifications
B.S. Applied Mathematics and Geology, Union College 1996
M.S. Geology, Portland State University 2004
Science and Products
The Chaitén rhyolite lava dome: Eruption sequence, lava dome volumes, rapid effusion rates and source of the rhyolite magma The Chaitén rhyolite lava dome: Eruption sequence, lava dome volumes, rapid effusion rates and source of the rhyolite magma
We use geologic field mapping and sampling, photogrammetric analysis of oblique aerial photographs, and digital elevation models to document the 2008-2009 eruptive sequence at Chaitén Volcano and to estimate volumes and effusion rates for the lava dome. We also present geochemical and petrologic data that contribute to understanding the source of the rhyolite and its unusually rapid...
Authors
John S. Pallister, Angela K. Diefenbach, William C. Burton, Jorge Munoz, Julia P. Griswold, Luis E. Lara, Jacob B. Lowenstern, Carolina E. Valenzuela
Recent explosive eruptions and volcano hazards at Soputan volcano—a basalt stratovolcano in north Sulawesi, Indonesia Recent explosive eruptions and volcano hazards at Soputan volcano—a basalt stratovolcano in north Sulawesi, Indonesia
Soputan is a high-alumina basalt stratovolcano located in the active North Sulawesi-Sangihe Islands magmatic arc. Although immediately adjacent to the still geothermally active Quaternary Tondono Caldera, Soputan’s magmas are geochemically distinct from those of the caldera and from other magmas in the arc. Unusual for a basalt volcano, Soputan produces summit lava domes and explosive...
Authors
Kushendratno, John S. Pallister, Kristianto, Farid Ruskanda Bina, Wendy McCausland, Simon Carn, Julia P. Griswold, Ronald H. Keeler
The 2010 explosive eruption of Java's Merapi volcano—A ‘100-year’ event The 2010 explosive eruption of Java's Merapi volcano—A ‘100-year’ event
Merapi volcano (Indonesia) is one of the most active and hazardous volcanoes in the world. It is known for frequent small to moderate eruptions, pyroclastic flows produced by lava dome collapse, and the large population settled on and around the flanks of the volcano that is at risk. Its usual behavior for the last decades abruptly changed in late October and early November 2010, when...
Authors
Surono, Philippe Jousset, John S. Pallister, Marie Boichu, M. Fabrizia Buongiorno, Agus Budisantoso, Fidel Costa, Supriyati Andreastuti, Fred Prata, David J. Schneider, Lieven Clarisse, Hanik Humaida, Sri Sumarti, Christian Bignami, Julia P. Griswold, Simon A. Carn, Clive Oppenheimer, Franck Lavigne
Positive feedback and momentum growth during debris-flow entrainment of wet bed sediment Positive feedback and momentum growth during debris-flow entrainment of wet bed sediment
Debris flows typically occur when intense rainfall or snowmelt triggers landslides or extensive erosion on steep, debris-mantled slopes. The flows can then grow dramatically in size and speed as they entrain material from their beds and banks, but the mechanism of this growth is unclear. Indeed, momentum conservation implies that entrainment of static material should retard the motion of...
Authors
Richard M. Iverson, Mark E. Reid, Matthew Logan, Richard G. Lahusen, Jonathan W. Godt, Julia P. Griswold
Mobility statistics and automated hazard mapping for debris flows and rock avalanches Mobility statistics and automated hazard mapping for debris flows and rock avalanches
Power-law equations that are physically motivated and statistically tested and calibrated provide a basis for forecasting areas likely to be inundated by debris flows, rock avalanches, and lahars with diverse volumes. The equations A=α1V2/3 and B=α2V2/3 are based on the postulate that the maximum valley cross-sectional area (A) and total valley planimetric area (B) likely to be inundated...
Authors
Julia P. Griswold, Richard M. Iverson
Mount St. Helens reloaded--Applying GIS to the ongoing eruption of Mount St. Helens, Washington Mount St. Helens reloaded--Applying GIS to the ongoing eruption of Mount St. Helens, Washington
No abstract available.
Authors
D.W. Ramsey, S. P. Schilling, J.E. Robinson, Julia P. Griswold, R. S. Wardell, John W. Ewert
Science and Products
The Chaitén rhyolite lava dome: Eruption sequence, lava dome volumes, rapid effusion rates and source of the rhyolite magma The Chaitén rhyolite lava dome: Eruption sequence, lava dome volumes, rapid effusion rates and source of the rhyolite magma
We use geologic field mapping and sampling, photogrammetric analysis of oblique aerial photographs, and digital elevation models to document the 2008-2009 eruptive sequence at Chaitén Volcano and to estimate volumes and effusion rates for the lava dome. We also present geochemical and petrologic data that contribute to understanding the source of the rhyolite and its unusually rapid...
Authors
John S. Pallister, Angela K. Diefenbach, William C. Burton, Jorge Munoz, Julia P. Griswold, Luis E. Lara, Jacob B. Lowenstern, Carolina E. Valenzuela
Recent explosive eruptions and volcano hazards at Soputan volcano—a basalt stratovolcano in north Sulawesi, Indonesia Recent explosive eruptions and volcano hazards at Soputan volcano—a basalt stratovolcano in north Sulawesi, Indonesia
Soputan is a high-alumina basalt stratovolcano located in the active North Sulawesi-Sangihe Islands magmatic arc. Although immediately adjacent to the still geothermally active Quaternary Tondono Caldera, Soputan’s magmas are geochemically distinct from those of the caldera and from other magmas in the arc. Unusual for a basalt volcano, Soputan produces summit lava domes and explosive...
Authors
Kushendratno, John S. Pallister, Kristianto, Farid Ruskanda Bina, Wendy McCausland, Simon Carn, Julia P. Griswold, Ronald H. Keeler
The 2010 explosive eruption of Java's Merapi volcano—A ‘100-year’ event The 2010 explosive eruption of Java's Merapi volcano—A ‘100-year’ event
Merapi volcano (Indonesia) is one of the most active and hazardous volcanoes in the world. It is known for frequent small to moderate eruptions, pyroclastic flows produced by lava dome collapse, and the large population settled on and around the flanks of the volcano that is at risk. Its usual behavior for the last decades abruptly changed in late October and early November 2010, when...
Authors
Surono, Philippe Jousset, John S. Pallister, Marie Boichu, M. Fabrizia Buongiorno, Agus Budisantoso, Fidel Costa, Supriyati Andreastuti, Fred Prata, David J. Schneider, Lieven Clarisse, Hanik Humaida, Sri Sumarti, Christian Bignami, Julia P. Griswold, Simon A. Carn, Clive Oppenheimer, Franck Lavigne
Positive feedback and momentum growth during debris-flow entrainment of wet bed sediment Positive feedback and momentum growth during debris-flow entrainment of wet bed sediment
Debris flows typically occur when intense rainfall or snowmelt triggers landslides or extensive erosion on steep, debris-mantled slopes. The flows can then grow dramatically in size and speed as they entrain material from their beds and banks, but the mechanism of this growth is unclear. Indeed, momentum conservation implies that entrainment of static material should retard the motion of...
Authors
Richard M. Iverson, Mark E. Reid, Matthew Logan, Richard G. Lahusen, Jonathan W. Godt, Julia P. Griswold
Mobility statistics and automated hazard mapping for debris flows and rock avalanches Mobility statistics and automated hazard mapping for debris flows and rock avalanches
Power-law equations that are physically motivated and statistically tested and calibrated provide a basis for forecasting areas likely to be inundated by debris flows, rock avalanches, and lahars with diverse volumes. The equations A=α1V2/3 and B=α2V2/3 are based on the postulate that the maximum valley cross-sectional area (A) and total valley planimetric area (B) likely to be inundated...
Authors
Julia P. Griswold, Richard M. Iverson
Mount St. Helens reloaded--Applying GIS to the ongoing eruption of Mount St. Helens, Washington Mount St. Helens reloaded--Applying GIS to the ongoing eruption of Mount St. Helens, Washington
No abstract available.
Authors
D.W. Ramsey, S. P. Schilling, J.E. Robinson, Julia P. Griswold, R. S. Wardell, John W. Ewert