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Earthquake Swarms in South America
For this thesis, we performed a manual search for earthquake swarms in South America using the PDE catalog. We chose to perform a manual search because global catalogs are deficient in lower magnitude events and have a potentially low number of events per swarm. With our technique we aim to be insensitive to spatial scales, temporal scales and particularly the number of earthquakes in the potential swarms since seismicity rates vary greatly over the South American continent. However, with a manual search we sacrifice a rigorous approach for one that requires individual interpretation. We identify 35 possible swarms of varying spatial scales and tectonic locations with this search. For most o...
Timing and Rates of Events in the Generic Volcanic Earthquake Swarm Model
In this thesis I combine data from 29 volcanic earthquake swarms that follow the pattern predicted by the Generic Volcanic Earthquake Swarm Model (GVESM; Benoit and McNutt, 1996) to investigate whether the relative timing of various parameters of pre-eruptive volcanic earthquake swarms could be used to forecast the time of an impending eruption. Based on the analysis of seismic unrest preceding many eruptions, the GVESM suggests that it is common to see an increase first in high-frequency earthquakes, then low-frequency earthquakes, then the onset of volcanic tremor. While this pattern is useful to volcano-seismologists, the relative timing and durations of these three different types of vol...
Seismogenesis and Earthquake Forecasting: The Frank Evison Volume II
This special issue of Pure and Applied Geophysics is the second of two volumes containing an augmented collection of papers originating from the Evison Symposium on Seismogenesis and Earthquake Forecasting held in Wellington, New Zealand, in February 2008. The volumes honor Frank Evison's interest in earthquake generation and forecasting. This volume includes descriptions of earthquake forecasting test centers through the Collaboratory for the Study of Earthquake Predictability (CSEP) program and the first results from the Regional Earthquake Likelihood Model (RELM) experiment in California. Other papers discuss methods of testing predictions, in particular by the use of error diagrams. Ther...
Intraplate Earthquake Swarms in Greenland and Adjacent Continental Regions
Discusses earthquakes swarms which occurred in Greenland in 1978 and compares some common features of earthquake swarms in Greenland, Norway and northern Canada.
Structural Analysis of Enola and Greenbier, Arkansas Earthquake Swarms
Almost 20 years after the remarkable earthquake swarm of 1982, near the town of Enola, Arkansas, with more than 40,000 micro-earthquakes, another event revisited the same North-Central Arkansas region in 2001. Nine years later, in 2010, a huge swarm event shook the northern part of Faulkner County, around the city of Guy. The following year, this seismic swarm event apparently migrated southward towards the city of Greenbrier, with an increase in the number of yearly recorded events. A 13km previously unrecognized, NE trending Guy-Greenbrier basement fault was revealed as a result of these swarm events. Within the vicinity of the Greenbrier earthquake swarm in the eastern Arkoma basin, north...
Seismogenesis and Earthquake Forecasting: The Frank Evison Volume I
This special issue of Pure and Applied Geophysics is one of two volumes containing an augmented collection of papers originating from the Evison Symposium on Seismogenesis and Earthquake Forecasting held in Wellington, New Zealand, in February 2008. The volumes honor Frank Evison's interest in earthquake generation and forecasting. A biography of Frank Evison and a list of his publications is included, as well as review papers and new research papers in the field. The volume includes papers related to Frank's most abiding interest of precursory earthquake swarms. The research contributions cover a range of current forecasting methods such as the Epidemic-Type Aftershock model, the Every Eart...
