Publications
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Volcano-tectonic implications of 3-D velocity structures derived from joint active and passive source tomography of the island of Hawaii
We present a velocity model of the onshore and offshore regions around the southern part of the island of Hawaii, including southern Mauna Kea, southeastern Hualalai, and the active volcanoes of Mauna Loa, and Kilauea, and Loihi seamount. The velocity model was inverted from about 200,000 first-arrival traveltime picks of earthquakes and air gun shots recorded at the Hawaiian Volcano Observatory (
Authors
J. Park, J.K. Morgan, C.A. Zelt, P. G. Okubo
The morphology and distribution of submerged reefs in the Maui-Nui Complex, Hawaii: New insights into their evolution since the Early Pleistocene
Reef drowning and backstepping have long been recognised as reef responses to sea-level rise on subsiding margins. During the Late Pleistocene (~500–14 ka) Hawaiian reefs grew in response to rapid subsidence and 120 m 100 kyr sea-level cycles, with recent work on the submerged drowned reefs around the big island of Hawaii, and in other locations from the last deglacial, providing insight into ree
Authors
Iain D.E. Faichney, James M. Webster, David A. Clague, Chris Kelley, Bruce Applegate, James G. Moore
Infrasonic ambient noise interferometry from correlations of microbaroms
We show that microbaroms, continuous infrasound fluctuations resulting from the interaction of the ocean with the atmosphere, have long-range correlation properties that make it possible to estimate the impulse response between two microphones from passive recordings. The processing is analogous to methods employed in the emerging field of ambient noise seismology, where the random noise source is
Authors
M.M. Haney
Integrated analysis of PALSAR/Radarsat-1 InSAR and ENVISAT altimeter data for mapping of absolute water level changes in Louisiana wetlands
Interferometric Synthetic Aperture Radar (InSAR) has been used to detect relative water level changes in wetlands. We developed an innovative method to integrate InSAR and satellite radar altimetry for measuring absolute or geocentric water level changes and applied the methodology to remote areas of swamp forest in coastal Louisiana. Coherence analysis of InSAR pairs suggested that the HH polariz
Authors
J.-W. Kim, Z. Lu, H. Lee, C. K. Shum, C.M. Swarzenski, T.W. Doyle, S.-H. Baek
Objective rapid delineation of areas at risk from block-and-ash pyroclastic flows and surges
Assessments of pyroclastic flow (PF) hazards are commonly based on mapping of PF and surge deposits and estimations of inundation limits, and/or computer models of varying degrees of sophistication. In volcanic crises a PF hazard map may be sorely needed, but limited time, exposures, or safety aspects may preclude fieldwork, and insufficient time or baseline data may be available for reliable dyna
Authors
C. Widiwijayanti, B. Voight, D. Hidayat, S. P. Schilling
Variations in population exposure and sensitivity to lahar hazards from Mount Rainier, Washington
Although much has been done to understand, quantify, and delineate volcanic hazards, there are fewer efforts to assess societal vulnerability to these hazards, particularly demographic differences in exposed populations or spatial variations in exposure to regional hazards. To better understand population diversity in volcanic hazard zones, we assess the number and types of people in a single type
Authors
N. Wood, C. Soulard
Diverse lavas from closely spaced volcanoes drawing from a common parent: Emmons Lake Volcanic Center, Eastern Aleutian Arc
Emmons Lake Volcanic Center (ELVC) on the lower Alaskan Peninsula is one of the largest and most diverse volcanic centers in the Aleutian Arc. Since the Middle Pleistocene, eruption of ~ 350 km3 of basalt through rhyolite has produced a 30 km, arc front chain of nested calderas and overlapping stratovolcanoes. ELVC has experienced as many as five major caldera-forming eruptions, the most recent, a
Authors
M. Mangan, T. Miller, C. Waythomas, F. Trusdell, A. Calvert, P. Layer
El Chichón's "surprise" eruption in 1982: lessons for reducing volcano risk
During one week (28 March–4 April 1982), three powerful explosive eruptions (VEI 5) of El Chichón Volcano caused the worst volcanic disaster in Mexico's recorded history. Pyroclastic flows and surges obliterated nine villages, killing about 2,000 people, and ashfalls downwind posed socio–economic hardships for many thousands of inhabitants of the States of Chiapas and Tabasco. The unexpected and v
Authors
R. I. Tilling
Interactions between soil thermal and hydrological dynamics in the response of Alaska ecosystems to fire disturbance
Soil temperature and moisture are important factors that control many ecosystem processes. However, interactions between soil thermal and hydrological processes are not adequately understood in cold regions, where the frozen soil, fire disturbance, and soil drainage play important roles in controlling interactions among these processes. These interactions were investigated with a new ecosystem mod
Authors
Shuhua Yi, A. David McGuire, Jennifer Harden, Eric Kasischke, Kristen L. Manies, Larry Hinzman, Anna K. Liljedahl, J. Randerson, Heping Liu, Vladimir E. Romanovsky, Sergey S. Marchenko, Yongwon Kim
The post-Mazama northwest rift zone eruption at Newberry Volcano, Oregon
The northwest rift zone (NWRZ) eruption took place at Newberry Volcano ~7000 years ago after the volcano was mantled by tephra from the catastrophic eruption that destroyed Mount Mazama and produced the Crater Lake caldera. The NWRZ eruption produced multiple lava flows from a variety of vents including cinder cones, spatter vents, and fissures, possibly in more than one episode. Eruptive behavior
Authors
Daniele McKay, Julie M. Donnelly-Nolan, Robert A. Jensen, Duane E. Champion
Many monstrous Missoula floods down channeled scabland and Columbia Valley, Washington
The late Wisconsin Missoula floods are Earth's largest known discharges of fresh water. They carved Washington's Channeled Scabland--made famous by J H. Bretz's writings in the 1920s to 1950s--and deposited sporadic huge gravel bars in the Scab-lands and Columbia valley. Since the late 1970s the great floods have been shown to number several score and to have been released as gigantic jökulhlaups.
Authors
Richard B. Waitt, Roger P. Denlinger, Jim O'Connor
Eruption-related lahars and sedimentation response downstream of Mount Hood: Field guide to volcaniclastic deposits along the Sandy River, Oregon
Late Holocene dome-building eruptions at Mount Hood during the Timberline and Old Maid eruptive periods resulted in numerous dome-collapse pyroclastic flows and lahars that moved large volumes of volcaniclastic sediment into temporary storage in headwater canyons of the Sandy River. During each eruptive period, accelerated sediment loading to the river through erosion and remobilization of volcani
Authors
Tom C. Pierson, William E. Scott, James W. Vallance, Patrick T. Pringle