Skip to main content
Advanced Search

Filters: partyWithName: Hsieh, P A (X)

Folders: ROOT > ScienceBase Catalog > USGS National Research Program > USGS National Research Program Projects > Hydrology of Fractured Rocks ( Show all descendants )

7 results (75ms)   

Location

Folder
ROOT
_ScienceBase Catalog
__USGS National Research Program
___USGS National Research Program Projects
____Hydrology of Fractured Rocks
View Results as: JSON ATOM CSV
We examine 20-yr data sets of seismic activity from 10 volcanic areas in the western United States for annual periodic signals (seasonality), focusing on large calderas (Long Valley caldera and Yellowstone) and stratovolcanoes (Cascade Range). We apply several statistical methods to test for seasonality in the seismic catalogs. In 4 of the 10 regions, statistically significant seasonal modulation of seismicity (> 90% probability) occurs, such that there is an increase in the monthly seismicity during a given portion of the year. In five regions, seasonal seismicity is significant in the upper 3 km of the crust. Peak seismicity occurs in the summer and autumn in Mt. St. Helens, Hebgen Lake/Madison Valley, Yellowstone...
Ground surface displacement (GSD) in large calderas is often interpreted as resulting from magma intrusion at depth. Recent advances in geodetic measurements of GSD, notably interferometric synthetic aperture radar, reveal complex and multifaceted deformation patterns that often require complex source models to explain the observed GSD. Although hydrothermal fluids have been discussed as a possible deformation agent, very few quantitative studies addressing the effects of multiphase flow on crustal mechanics have been attempted. Recent increases in the power and availability of computing resources allow robust quantitative assessment of the complex time‐variant thermal interplay between aqueous fluid flow and crustal...
Categories: Publication; Types: Citation; Tags: caldera, hydrothermal, model