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The 2003 eruption of Anatahan volcano, Commonwealth of the Northern Mariana Islands: Chronology, volcanology, and deformation The 2003 eruption of Anatahan volcano, Commonwealth of the Northern Mariana Islands: Chronology, volcanology, and deformation

The first historical eruption on Anatahan Island occurred on 10 May 2003 from the east crater of the volcano. The eruption was preceded by several hours of seismicity. Two and a half hours before the outbreak, the number of earthquakes surged to more than 100 events per hour. At 0730 UTC, the Washington Volcanic Ash Advisory Center issued an ash advisory. Although the eruption lasted for...
Authors
F. A. Trusdell, R. B. Moore, M. Sako, R.A. White, S.K. Koyanagi, R. Chong, J.T. Camacho

Oligocene and earliest Miocene diatom biostratigraphy of ODP leg 199 site 1220, equatorial Pacific Oligocene and earliest Miocene diatom biostratigraphy of ODP leg 199 site 1220, equatorial Pacific

Completion of studies on material collected during Ocean Drilling Program Leg 199 at Site 1220 in the equatorial Pacific allows calibration of the ranges of >35 stratigraphically important diatoms to paleomagnetic stratigraphy for the Oligocene and earliest Miocene (~33.5–21.5 Ma). The taxonomy of these taxa is reviewed, and age estimates of their first and last occurrences are compiled...
Authors
John A. Barron, Elisabeth Fourtanier, S. M. Bohaty

The world's largest floods, past and present: Their causes and magnitudes The world's largest floods, past and present: Their causes and magnitudes

Floods are among the most powerful forces on earth. Human societies worldwide have lived and died with floods from the very beginning, spawning a prominent role for floods within legends, religions, and history. Inspired by such accounts, geologists, hydrologists, and historians have studied the role of floods on humanity and its supporting ecosystems, resulting in new appreciation for...
Authors
Jim E. O'Connor, John E. Costa

Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2003 Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2003

The Alaska Volcano Observatory (AVO), a cooperative program of the U.S. Geological Survey, the Geophysical Institute of the University of Alaska Fairbanks, and the Alaska Division of Geological and Geophysical Surveys, has maintained seismic monitoring networks at historically active volcanoes in Alaska since 1988. The primary objectives of this program are the near real time seismic...
Authors
James P. Dixon, Scott D. Stihler, John A. Power, Guy Tytgat, Seth C. Moran, John J. Sanchez, Stephen R. McNutt, Steve Estes, John Paskievitch

The Alaska Volcano Observatory - Expanded monitoring of volcanoes yields results The Alaska Volcano Observatory - Expanded monitoring of volcanoes yields results

Recent explosive eruptions at some of Alaska's 52 historically active volcanoes have significantly affected air traffic over the North Pacific, as well as Alaska's oil, power, and fishing industries and local communities. Since its founding in the late 1980s, the Alaska Volcano Observatory (AVO) has installed new monitoring networks and used satellite data to track activity at Alaska's...
Authors
Steven R. Brantley, Robert G. McGimsey, Christina A. Neal

Geology of the Ugashik-Mount Peulik Volcanic Center, Alaska Geology of the Ugashik-Mount Peulik Volcanic Center, Alaska

The Ugashik-Mount Peulik volcanic center, 550 km southwest of Anchorage on the Alaska Peninsula, consists of the late Quaternary 5-km-wide Ugashik caldera and the stratovolcano Mount Peulik built on the north flank of Ugashik. The center has been the site of explosive volcanism including a caldera-forming eruption and post-caldera dome-destructive activity. Mount Peulik has been formed...
Authors
Thomas P. Miller

Chemical analyses of tertiary volcanic rocks, central San Juan caldera complex, southwestern Colorado Chemical analyses of tertiary volcanic rocks, central San Juan caldera complex, southwestern Colorado

In conjunction with integrated mapping of the Oligocene central San Juan caldera cluster, southwestern Colorado (USGS I-Map 2799, in press), all modern chemical analyses of volcanic rocks for this area determined in laboratories of the U.S. Geological Survey have been re-evaluated in terms of the stratigraphic sequence as presently understood. These include approximately 700 unpublished...
Authors
Peter W. Lipman
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