Seth Moran, Ph.D.
My professional career has largely been devoted to the study of active volcanoes and volcano seismology, with a hiatus in 2015-2020 to serve as the Scientist-in-Charge of the Cascades Volcano Observatory. I am interested in all things volcanoes and seismology, as well as hazards in general.
Science and Products
Filter Total Items: 58
Self-similar rupture implied by scaling properties of volcanic earthquakes occurring during the 2004-2008 eruption of Mount St. Helens, Washington Self-similar rupture implied by scaling properties of volcanic earthquakes occurring during the 2004-2008 eruption of Mount St. Helens, Washington
We analyze a group of 6073 low-frequency earthquakes recorded during a week-long temporary deployment of broadband seismometers at distances of less than 3 km from the crater at Mount St. Helens in September of 2006. We estimate the seismic moment (M0) and spectral corner frequency (f0) using a spectral ratio approach for events with a high signal-to-noise (SNR) ratio that have a cross...
Authors
Rebecca M. Harrington, Grzegorz Kwiatek, Seth C. Moran
Attenuation and scattering tomography of the deep plumbing system of Mount St. Helens Attenuation and scattering tomography of the deep plumbing system of Mount St. Helens
We present a combined 3-D P wave attenuation, 2-D S coda attenuation, and 3-D S coda scattering tomography model of fluid pathways, feeding systems, and sediments below Mount St. Helens (MSH) volcano between depths of 0 and 18 km. High-scattering and high-attenuation shallow anomalies are indicative of magma and fluid-rich zones within and below the volcanic edifice down to 6 km depth...
Authors
Luca De Siena, Christine Thomas, Greg P. Waite, Seth C. Moran, Stefan Klemme
Volcanic tremor masks its seismogenic source: Results from a study of noneruptive tremor recorded at Mount St. Helens, Washington Volcanic tremor masks its seismogenic source: Results from a study of noneruptive tremor recorded at Mount St. Helens, Washington
On 2 October 2004, a significant noneruptive tremor episode occurred during the buildup to the 2004–2008 eruption of Mount St. Helens (Washington). This episode was remarkable both because no explosion followed, and because seismicity abruptly stopped following the episode. This sequence motivated us to consider a model for volcanic tremor that does not involve energetic gas release from...
Authors
Roger P. Denlinger, Seth C. Moran
Deep long-period earthquakes west of the volcanic arc in Oregon: evidence of serpentine dehydration in the fore-arc mantle wedge Deep long-period earthquakes west of the volcanic arc in Oregon: evidence of serpentine dehydration in the fore-arc mantle wedge
Here we report on deep long-period earthquakes (DLPs) newly observed in four places in western Oregon. The DLPs are noteworthy for their location within the subduction fore arc: 40–80 km west of the volcanic arc, well above the slab, and near the Moho. These “offset DLPs” occur near the top of the inferred stagnant mantle wedge, which is likely to be serpentinized and cold. The lack of...
Authors
John E. Vidale, David A. Schmidt, Stephen D. Malone, Alicia J. Hotovec-Ellis, Seth C. Moran, Kenneth C. Creager, Heidi Houston
Evidence for fluid-triggered slip in the 2009 Mount Rainier, Washington earthquake swarm Evidence for fluid-triggered slip in the 2009 Mount Rainier, Washington earthquake swarm
A vigorous swarm of over 1000 small, shallow earthquakes occurred 20–22 September 2009 beneath Mount Rainier, Washington, including the largest number of events ever recorded in a single day at Rainier since seismic stations were installed on the edifice in 1989. Many events were only clearly recorded on one or two stations on the edifice, or they overlapped in time with other events...
Authors
David R. Shelly, Seth C. Moran, Weston A. Thelen
Shallow repeating seismic events under an alpine glacier at Mount Rainier, Washington, USA Shallow repeating seismic events under an alpine glacier at Mount Rainier, Washington, USA
We observed several swarms of repeating low-frequency (1–5 Hz) seismic events during a 3 week period in May–June 2010, near the summit of Mount Rainier, Washington, USA, that likely were a result of stick–slip motion at the base of alpine glaciers. The dominant set of repeating events ('multiplets') featured >4000 individual events and did not exhibit daytime variations in recurrence...
Authors
Weston A. Thelen, Kate E. Allstadt, Silvio De Angelis, Stephen D. Malone, Seth C. Moran, John Vidale
Science and Products
Filter Total Items: 58
Self-similar rupture implied by scaling properties of volcanic earthquakes occurring during the 2004-2008 eruption of Mount St. Helens, Washington Self-similar rupture implied by scaling properties of volcanic earthquakes occurring during the 2004-2008 eruption of Mount St. Helens, Washington
We analyze a group of 6073 low-frequency earthquakes recorded during a week-long temporary deployment of broadband seismometers at distances of less than 3 km from the crater at Mount St. Helens in September of 2006. We estimate the seismic moment (M0) and spectral corner frequency (f0) using a spectral ratio approach for events with a high signal-to-noise (SNR) ratio that have a cross...
Authors
Rebecca M. Harrington, Grzegorz Kwiatek, Seth C. Moran
Attenuation and scattering tomography of the deep plumbing system of Mount St. Helens Attenuation and scattering tomography of the deep plumbing system of Mount St. Helens
We present a combined 3-D P wave attenuation, 2-D S coda attenuation, and 3-D S coda scattering tomography model of fluid pathways, feeding systems, and sediments below Mount St. Helens (MSH) volcano between depths of 0 and 18 km. High-scattering and high-attenuation shallow anomalies are indicative of magma and fluid-rich zones within and below the volcanic edifice down to 6 km depth...
Authors
Luca De Siena, Christine Thomas, Greg P. Waite, Seth C. Moran, Stefan Klemme
Volcanic tremor masks its seismogenic source: Results from a study of noneruptive tremor recorded at Mount St. Helens, Washington Volcanic tremor masks its seismogenic source: Results from a study of noneruptive tremor recorded at Mount St. Helens, Washington
On 2 October 2004, a significant noneruptive tremor episode occurred during the buildup to the 2004–2008 eruption of Mount St. Helens (Washington). This episode was remarkable both because no explosion followed, and because seismicity abruptly stopped following the episode. This sequence motivated us to consider a model for volcanic tremor that does not involve energetic gas release from...
Authors
Roger P. Denlinger, Seth C. Moran
Deep long-period earthquakes west of the volcanic arc in Oregon: evidence of serpentine dehydration in the fore-arc mantle wedge Deep long-period earthquakes west of the volcanic arc in Oregon: evidence of serpentine dehydration in the fore-arc mantle wedge
Here we report on deep long-period earthquakes (DLPs) newly observed in four places in western Oregon. The DLPs are noteworthy for their location within the subduction fore arc: 40–80 km west of the volcanic arc, well above the slab, and near the Moho. These “offset DLPs” occur near the top of the inferred stagnant mantle wedge, which is likely to be serpentinized and cold. The lack of...
Authors
John E. Vidale, David A. Schmidt, Stephen D. Malone, Alicia J. Hotovec-Ellis, Seth C. Moran, Kenneth C. Creager, Heidi Houston
Evidence for fluid-triggered slip in the 2009 Mount Rainier, Washington earthquake swarm Evidence for fluid-triggered slip in the 2009 Mount Rainier, Washington earthquake swarm
A vigorous swarm of over 1000 small, shallow earthquakes occurred 20–22 September 2009 beneath Mount Rainier, Washington, including the largest number of events ever recorded in a single day at Rainier since seismic stations were installed on the edifice in 1989. Many events were only clearly recorded on one or two stations on the edifice, or they overlapped in time with other events...
Authors
David R. Shelly, Seth C. Moran, Weston A. Thelen
Shallow repeating seismic events under an alpine glacier at Mount Rainier, Washington, USA Shallow repeating seismic events under an alpine glacier at Mount Rainier, Washington, USA
We observed several swarms of repeating low-frequency (1–5 Hz) seismic events during a 3 week period in May–June 2010, near the summit of Mount Rainier, Washington, USA, that likely were a result of stick–slip motion at the base of alpine glaciers. The dominant set of repeating events ('multiplets') featured >4000 individual events and did not exhibit daytime variations in recurrence...
Authors
Weston A. Thelen, Kate E. Allstadt, Silvio De Angelis, Stephen D. Malone, Seth C. Moran, John Vidale