Publications
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Stress and mass changes at a “wet” volcano: Example during the 2011–2012 volcanic unrest at Kawah Ijen volcano (Indonesia)
Since 2010, Kawah Ijen volcano has been equipped with seismometers, and its extremely
acid volcanic lake has been monitored using temperature and leveling sensors, providing unprecedented
time resolution of multiparametric data for an acidic volcanic lake. The nature of stress and mass changes
of the volcano is studied by combining seismic analyses and volcanic lake measurements that were made
dur
Authors
Corentin Caudron, Thomas Lecocq, Devy K. Syahbana, Wendy McCausland, Arnaud Watlet, Thierry Camelbeeck, Alain Bernard, Surono
Kawah Ijen volcanic activity: A review
Kawah Ijen is a composite volcano located at the easternmost part of Java island in Indonesia and hosts the largest natural acidic lake in the world. We have gathered all available historical reports on Kawah Ijen’s activity since 1770 with the purpose of reviewing the temporal evolution of its activity. Most of these observations and studies have been conducted from a geochemical perspective and
Authors
Corentin Caudron, Devy Kamil Syahbana, Thomas Lecocq, Vincent van Hinsberg, Wendy McCausland, Antoine Triantafyllou, Thierry Camelbeeck, Alain Bernard, Surono
Long Valley caldera and the UCERF depiction of Sierra Nevada range-front faults
Long Valley caldera lies within a left-stepping offset in the north-northwest-striking Sierra Nevada range-front normal faults with the Hilton Creek fault to the south and Hartley Springs fault to the north. Both Uniform California Earthquake Rupture Forecast (UCERF) 2 and its update, UCERF3, depict slip on these major range-front normal faults as extending well into the caldera, with significant
Authors
David P. Hill, Emily K. Montgomery-Brown
Monitoring changes in seismic velocity related to an ongoing rapid inflation event at Okmok volcano, Alaska
Okmok is one of the most active volcanoes in the Aleutian Arc. In an effort to improve our ability to detect precursory activity leading to eruption at Okmok, we monitor a recent, and possibly ongoing, GPS-inferred rapid inflation event at the volcano using ambient noise interferometry (ANI). Applying this method, we identify changes in seismic velocity outside of Okmok’s caldera, which are relate
Authors
Ninfa Bennington, Matthew M. Haney, Silvio De Angelis, Clifford Thurber, Jeff Freymueller
Aniakchak National Monument and Preserve: Geologic resources inventory report
This GRI report is a companion document to previously completed GRI digital geologic map data. It was written for resource managers to support science-informed decision making. It may also be useful for interpretation. The report was prepared using available geologic information, and the NPS Geologic Resources Division conducted no new fieldwork in association with its preparation. Sections of the
Authors
Chad P. Hults, Christina A. Neal
Lava lake level as a gauge of magma reservoir pressure and eruptive hazard
Forecasting volcanic activity relies fundamentally on tracking magma pressure through the use of proxies, such as ground surface deformation and earthquake rates. Lava lakes at open-vent basaltic volcanoes provide a window into the uppermost magma system for gauging reservoir pressure changes more directly. At Kīlauea Volcano (Hawaiʻi, USA) the surface height of the summit lava lake in Halemaʻumaʻ
Authors
Matthew R. Patrick, Kyle R. Anderson, Michael P. Poland, Tim R. Orr, Donald A. Swanson
Aluminosilicate melts and glasses at 1 to 3 GPa: Temperature and pressure effects on recovered structural and density changes
In the pressure range in the Earth’s mantle where many basaltic magmas are generated (1 to 3 GPa) (Stolper et al. 1981), increases in the coordination numbers of the network-forming cations in aluminosilicate melts have generally been considered to be minor, although effects on silicon and particularly on aluminum coordination in non-bridging oxygen-rich glasses from the higher, 5 to 12 GPa range,
Authors
S Bista, Jonathan Stebbins, William B. Hankins, Thomas W. Sisson
North Pacific deglacial hypoxic events linked to abrupt ocean warming
Marine sediments from the North Pacific document two episodes of expansion and strengthening of the subsurface oxygen minimum zone (OMZ) accompanied by seafloor hypoxia during the last deglacial transition1, 2, 3, 4. The mechanisms driving this hypoxia remain under debate1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11. We present a new high-resolution alkenone palaeotemperature reconstruction from the Gulf of A
Authors
Summer K Praetorius, Alan C. Mix, Maureen H. Davies, Matthew D Wolhowe, Jason A. Addison, Frederick G Prahl
Vegetation response to southern California drought during the Medieval Climate Anomaly and early Little Ice Age (AD 800–1600)
High-resolution studies of pollen in laminated sediments deposited in Santa Barbara Basin (SBB) core SPR0901-02KC reflect decadal-scale fluctuations in precipitation spanning the interval from AD 800–1600. From AD 800–1090 during the Medieval Climate Anomaly (MCA) SBB sediments were dominated by xeric vegetation types (drought-resistant coastal sagebrush and chaparral) implying reduced precipitati
Authors
Linda E. Heusser, Ingrid L. Hendy, John A. Barron
Tremor-genic slow slip regions may be deeper and warmer and may slip slower than non-tremor-genic regions
Slow slip events (SSEs) are observed worldwide and often coincide with tectonic tremor. Notable examples of SSEs lacking observed tectonic tremor, however, occur beneath Kīlauea Volcano, Hawaii, the Boso Peninsula, Japan, near San Juan Bautista on the San Andreas Fault, California, and recently in Central Ecuador. These SSEs are similar to other worldwide SSEs in many ways (e.g., size or duration)
Authors
Emily Montgomery-Brown, Ellen M. Syracuse
Linking microbial community structure and microbial processes: An empirical and conceptual overview
A major goal of microbial ecology is to identify links between microbial community structure and microbial processes. Although this objective seems straightforward, there are conceptual and methodological challenges to designing studies that explicitly evaluate this link. Here, we analyzed literature documenting structure and process responses to manipulations to determine the frequency of structu
Authors
R.L. Bier, Emily S. Bernhardt, Claudia M. Boot, Emily B. Graham, Edward K. Hall, Jay T. Lennon, Diana R. Nemergut, Brooke B. Osborne, Clara Ruiz-Gonzalez, Joshua P. Schimel, Mark P. Waldrop, Matthew D. Wallenstein
Delayed dynamic triggering of deep tremor along the Parkfield-Cholame section of the San Andreas Fault following the 2014 M6.0 South Napa earthquake
Large, distant earthquakes are known to trigger deep tectonic tremor along the San Andreas Fault and in subduction zones. However, there are relatively few observations of triggering from regional distance earthquakes. Here we show that a small tremor episode about 12–18 km NW of Parkfield was triggered during and immediately following the passage of surface waves from the 2014 Mw 6.0 South Napa m
Authors
Zhigang Peng, David R. Shelly, William L. Ellsworth