Nicholas (Nick) M Beeler
Nick Beeler is a scientist in the Earthquake Science Center.
Science and Products
Filter Total Items: 58
Re‐estimated effects of deep episodic slip on the occurrence and probability of great earthquakes in Cascadia Re‐estimated effects of deep episodic slip on the occurrence and probability of great earthquakes in Cascadia
Mazzotti and Adams (2004) estimated that rapid deep slip during typically two week long episodes beneath northern Washington and southern British Columbia increases the probability of a great Cascadia earthquake by 30–100 times relative to the probability during the ∼58 weeks between slip events. Because the corresponding absolute probability remains very low at ∼0.03% per week, their...
Authors
Nicholas M. Beeler, Evelyn A. Roeloffs, Wendy McCausland
Inferring fault rheology from low-frequency earthquakes on the San Andreas Inferring fault rheology from low-frequency earthquakes on the San Andreas
Families of recurring low-frequency earthquakes (LFEs) within nonvolcanic tremor (NVT) on the San Andreas fault in central California show strong sensitivity to shear stress induced by the daily tidal cycle. LFEs occur at all levels of the tidal shear stress and are in phase with the very small, ~400 Pa, stress amplitude. To quantitatively explain the correlation, we use a model from the...
Authors
Nicholas M. Beeler, Amanda Thomas, Roland Bürgmann, David R. Shelly
Faulting within the Mount St. Helens conduit and implications for volcanic earthquakes Faulting within the Mount St. Helens conduit and implications for volcanic earthquakes
The 2004–2008 eruption of Mount St. Helens produced seven dacite spines mantled by cataclastic fault rocks, comprising an outer fault core and an inner damage zone. These fault rocks provide remarkable insights into the mechanical processes that accompany extrusion of degassed magma, insights that are useful in forecasting dome-forming eruptions. The outermost part of the fault core...
Authors
John S. Pallister, Katharine V. Cashman, Jonathan T. Hagstrum, Nicholas M. Beeler, Seth C. Moran, Roger P. Denlinger
Observed source parameters for dynamic rupture with non-uniform initial stressand relatively high fracture energy Observed source parameters for dynamic rupture with non-uniform initial stressand relatively high fracture energy
We have conducted dynamic rupture propagation experiments to establish the relations between in-source stress drop, fracture energy and the resulting particle velocity during slip of an unconfined 2 m long laboratory fault at normal stresses between 4 and 8 MPa. To produce high fracture energy in the source we use a rough fault that has a large slip weakening distance. An artifact of the...
Authors
Nicholas M. Beeler, Brian D. Kilgore, Arthur F. McGarr, Jon Peter B. Fletcher, John R. Evans, Steven R. Baker
Tidal triggering of low frequency earthquakes near Parkfield, California: Implications for fault mechanics within the brittle-ductile transition Tidal triggering of low frequency earthquakes near Parkfield, California: Implications for fault mechanics within the brittle-ductile transition
Studies of nonvolcanic tremor (NVT) have established the significant impact of small stress perturbations on NVT generation. Here we analyze the influence of the solid earth and ocean tides on a catalog of ∼550,000 low frequency earthquakes (LFEs) distributed along a 150 km section of the San Andreas Fault centered at Parkfield. LFE families are identified in the NVT data on the basis of...
Authors
A.M. Thomas, R. Burgmann, David R. Shelly, Nicholas M. Beeler, M.L. Rudolph
Laboratory triggering of stick-slip events by oscillatory loading in the presence of pore fluid with implications for physics of tectonic tremor Laboratory triggering of stick-slip events by oscillatory loading in the presence of pore fluid with implications for physics of tectonic tremor
The physical mechanism by which the low-frequency earthquakes (LFEs) that make up portions of tectonic (also called non-volcanic) tremor are created is poorly understood. In many areas of the world, tectonic tremor and LFEs appear to be strongly tidally modulated, whereas ordinary earthquakes are not. Anomalous seismic wave speeds, interpreted as high pore fluid pressure, have been...
Authors
Noel M. Bartlow, David A. Lockner, Nicholas M. Beeler
Science and Products
Filter Total Items: 58
Re‐estimated effects of deep episodic slip on the occurrence and probability of great earthquakes in Cascadia Re‐estimated effects of deep episodic slip on the occurrence and probability of great earthquakes in Cascadia
Mazzotti and Adams (2004) estimated that rapid deep slip during typically two week long episodes beneath northern Washington and southern British Columbia increases the probability of a great Cascadia earthquake by 30–100 times relative to the probability during the ∼58 weeks between slip events. Because the corresponding absolute probability remains very low at ∼0.03% per week, their...
Authors
Nicholas M. Beeler, Evelyn A. Roeloffs, Wendy McCausland
Inferring fault rheology from low-frequency earthquakes on the San Andreas Inferring fault rheology from low-frequency earthquakes on the San Andreas
Families of recurring low-frequency earthquakes (LFEs) within nonvolcanic tremor (NVT) on the San Andreas fault in central California show strong sensitivity to shear stress induced by the daily tidal cycle. LFEs occur at all levels of the tidal shear stress and are in phase with the very small, ~400 Pa, stress amplitude. To quantitatively explain the correlation, we use a model from the...
Authors
Nicholas M. Beeler, Amanda Thomas, Roland Bürgmann, David R. Shelly
Faulting within the Mount St. Helens conduit and implications for volcanic earthquakes Faulting within the Mount St. Helens conduit and implications for volcanic earthquakes
The 2004–2008 eruption of Mount St. Helens produced seven dacite spines mantled by cataclastic fault rocks, comprising an outer fault core and an inner damage zone. These fault rocks provide remarkable insights into the mechanical processes that accompany extrusion of degassed magma, insights that are useful in forecasting dome-forming eruptions. The outermost part of the fault core...
Authors
John S. Pallister, Katharine V. Cashman, Jonathan T. Hagstrum, Nicholas M. Beeler, Seth C. Moran, Roger P. Denlinger
Observed source parameters for dynamic rupture with non-uniform initial stressand relatively high fracture energy Observed source parameters for dynamic rupture with non-uniform initial stressand relatively high fracture energy
We have conducted dynamic rupture propagation experiments to establish the relations between in-source stress drop, fracture energy and the resulting particle velocity during slip of an unconfined 2 m long laboratory fault at normal stresses between 4 and 8 MPa. To produce high fracture energy in the source we use a rough fault that has a large slip weakening distance. An artifact of the...
Authors
Nicholas M. Beeler, Brian D. Kilgore, Arthur F. McGarr, Jon Peter B. Fletcher, John R. Evans, Steven R. Baker
Tidal triggering of low frequency earthquakes near Parkfield, California: Implications for fault mechanics within the brittle-ductile transition Tidal triggering of low frequency earthquakes near Parkfield, California: Implications for fault mechanics within the brittle-ductile transition
Studies of nonvolcanic tremor (NVT) have established the significant impact of small stress perturbations on NVT generation. Here we analyze the influence of the solid earth and ocean tides on a catalog of ∼550,000 low frequency earthquakes (LFEs) distributed along a 150 km section of the San Andreas Fault centered at Parkfield. LFE families are identified in the NVT data on the basis of...
Authors
A.M. Thomas, R. Burgmann, David R. Shelly, Nicholas M. Beeler, M.L. Rudolph
Laboratory triggering of stick-slip events by oscillatory loading in the presence of pore fluid with implications for physics of tectonic tremor Laboratory triggering of stick-slip events by oscillatory loading in the presence of pore fluid with implications for physics of tectonic tremor
The physical mechanism by which the low-frequency earthquakes (LFEs) that make up portions of tectonic (also called non-volcanic) tremor are created is poorly understood. In many areas of the world, tectonic tremor and LFEs appear to be strongly tidally modulated, whereas ordinary earthquakes are not. Anomalous seismic wave speeds, interpreted as high pore fluid pressure, have been...
Authors
Noel M. Bartlow, David A. Lockner, Nicholas M. Beeler