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Potential tsunami hazards for the Fox Islands communities of Unalaska/Dutch Harbor and Akutan were evaluated by numerically modeling the extent of inundation from tsunami waves generated by hypothetical earthquake sources and taking into account historical observations. Worst-case hypothetical scenarios are defined by analyzing results of a sensitivity study of the tsunami dynamics related to various slip distributions along the Aleutian megathrust. The worst-case scenarios for Unalaska and Akutan are thought to be thrust earthquakes in the Fox Islands region with magnitudes ranging from Mw 8.8 to Mw 9.1 that have their greatest slip at 30-40 km (18-25 mi) depth. We also consider Tohoku-type ruptures and an outer-rise...
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The purpose of this study is to evaluate tsunami hazard for the community of Seward and northern Resurrection Bay area, Alaska. This report will provide guidance to local emergency managers in tsunami hazard assessment. We used a numerical modeling method to estimate the extent of inundation by tsunami waves generated from earthquake and landslide sources. Our tsunami scenarios included a repeat of the tsunami of the 1964 Great Alaska Earthquake, as well as tsunami waves generated by two hypothetical Yakataga Gap earthquakes in northeastern Gulf of Alaska, hypothetical earthquakes in Prince William Sound and Kodiak asperities of the 1964 rupture, and local underwater landslides in Resurrection Bay. Results of numerical...
An outcrop of the Ohio Shale at Copperas Mountain near Bainbridge in Ross County, Ohio. Unit lithology in this area is Ohio Shale overlain by Bedford Shale and Berea Sandstone. Bedrock is from the Devonian Geologic Period. The photograph was taken in 1986.
Outcrop of the Upper Mercer limestone of the Pottsville Group in Tuscarawas Township, Stark County, Ohio. This area has shale, siltstone, sandstone, conglomerate, limestone and coal lithologies. Bedrock is from the Pennsylvanian Geologic Period. Russell A. Brant is noted with the image information.This may be a photograph of work done by Richard M. DeLong for Measured Stratigraphic Section File Number 15129 in 1961.
Ohio Geological Survey geologist Richard Carlton on top of an outcrop of the Ohio Shale at Copperas Mountain near Bainbridge in Ross County, Ohio. Unit lithology in this area is Ohio Shale overlain by Bedford Shale and Berea Sandstone. Bedrock is from the Devonian Geologic Period. The photograph was taken in 1978.
An outcrop of the Bedford Shale and the Berea Sandstone on the east side of United States Highway 23 north of Chillicothe, Ross County, Ohio. Unit lithology in this area is shale, siltstone, and sandstone. Bedrock is from the Devonian Geologic Period. The photograph was taken by Michael C. Hansen in 1979.
An outcrop of the Ohio Shale at Copperas Mountain near Bainbridge in Ross County, Ohio. Paint Creek is visible in the Photograph. Unit lithology in this area is Ohio Shale overlain by Bedford Shale and Berea Sandstone. Bedrock is from the Devonian Geologic Period. The photograph was taken by Pauline Smyth on April 2, 1955.
An outcrop of the Pottsville Group-Sharon sandstone/conglomerate in Liberty Township, Jackson County, Ohio. Many scenic gorges, cliff exposures and outliers like this one known as
Ohio Academy of Science fieldtrip in 1985 at Backbone Creek in Clermont County, Ohio. Image shows outcrop along the streambed. The rock surface has persistent iron (Fe) staining from ground-water seeps. Unit lithology in this area is interbedded limestone and shale. Bedrock is from the Ordovician Geologic Period.
National Lime & Stone Company quarry at Carey, Wyandot County, Ohio. Lockport (formerly Guelph) Dolomite is found at this location. Unit lithology in this area is dolomite and shale. Bedrock is from the Silurian Geologic Period. Michael C. Hansen took this photograph probably in the late 1970s.
An outcrop of the Cleveland Shale Member of the Ohio Shale along the Rocky River in Cuyahoga County, Ohio. Unit lithology in this area is shale, siltstone, and sandstone. Bedrock is from the Devonian Geologic Period. The photograph was taken by Dr. Paul Potter.
An outcrop of the Chagrin Shale Member of the Ohio Shale along Mill Creek in Hogback Ridge Metropolitan Park, Lake County, Ohio. This area is a locality for Echinocaris fossils of the Phylum Arthropoda. Unit lithology in this area is shale, siltstone, and sandstone. Bedrock is from the Devonian Geologic Period. The photograph was taken by Michael C. Hansen in 1975.
National Lime & Stone Company quarry at Carey, Wyandot County, Ohio. This close-up image of Lockport (formerly Guelph) Dolomite shows reef core facies. Bedrock is from the Silurian Geologic Period. Michael C. Hansen took this photograph probably in the late 1970s.
National Lime & Stone Company quarry at Carey, Wyandot County, Ohio. Lockport (formerly Guelph) Dolomite is found at this location. Unit lithology is dolomite and shale. Bedrock is from the Silurian Geologic Period. Michael C. Hansen took this photograph probably in the late 1970s.
An outcrop with the base of the Cleveland Shale Member of the Ohio Shale in West Creek, locally known as Skinner's Run, east of Broadview Road in Brooklyn Heights, Cuyahoga County, Ohio. Unit lithology in this area is shale, siltstone, and sandstone. Bedrock is from the Devonian Geologic Period. The photograph was taken in 1982.
A roadcut showing contact of the Bedford Shale with the Berea Sandstone on the west side of Interstate 77 south of mile marker 155 at Independence, Cuyahoga County, Ohio. Bedrock is from the Devonian Geologic Period. The photograph was taken by Michael C. Hansen in 1981.
An outcrop of the Cleveland Shale Member of the Ohio Shale along the Rocky River at Cedar Point Road in Berea, Cuyahoga County, Ohio. Unit lithology in this area is shale, siltstone, and sandstone. Bedrock is from the Devonian Geologic Period. The photograph was taken by Michael C. Hansen in 1984.
Cedarville Dolomite at the Cedarville Quarry in Greene County, Ohio. Unit lithology in this area is dolomite and shale. Bedrock is from the Silurian Geologic Period. Photograph taken by Douglas L. Shrake on August 20, 1991.
The American Aggregates Corporation's Cedarville Quarry site in Greene County, Ohio. This area has dolomite and shale lithologies. Bedrock is from the Silurian Geologic Period. Geologists Gregory A. Schumacher, E. Mac Swinford, Ernie R. Slucher, David A. Stith, and Dennis N. Hull of the Ohio Geological Survey are pictured with geologists Greg Klosterman and Ken Coats of American Aggregates Corporation. The photograph was taken by Douglas L. Shrake on August 20, 1991.
Cliffs near Lynx, Ohio, in Adams County. Unit lithology in this area is shale and dolomite. Bedrock is from the Silurian Geologic Period. This image was an entry in the 1982 Ohio Geology Slide Contest.


map background search result map search result map Ohio Acadmey of Science Fieldtrip, Clermont County, Ohio, 1985 National Lime & Stone Company Quarry, Carey, Ohio, 1978 National Lime & Stone Company Quarry, Carey, Ohio, 1978 National Lime & Stone Company Quarry, Carey, Ohio, 1978 Cedarville Quarry, Greene County, Ohio, 1991 Cedarville Quarry, Greene County, Ohio, 1991 Cliffs Near Lynx, Adams County, Ohio, 1980s Ohio Shale Outcrop at Copperas Mountain, Ross County, Ohio, 1978 Ohio Shale Outcrop at Copperas Mountain, Ross County, Ohio, 1986 Ohio Shale Outcrop at Copperas Mountain, Ross County, Ohio, 1955 Chagrin Shale Member Outcrop at Hogback Ridge Metro Park, Lake County, Ohio, 1975 Cleveland Shale Member Outcrop, Cuyahoga County, Ohio, 1982 Cleveland Shale Member Outcrop, Cuyahoga County, Ohio Cleveland Shale Outcrop, Cuyahoga County, Ohio, 1984 Bedford Shale Contact with Berea Sandstone, Cuyahoga County, Ohio, 1981 Outcrop of the Bedford Shale and Berea Sandstone, Ross County, Ohio, 1979 Mercer Limestone, Stark County, Ohio, 1960s Big Rock, Jackson County, Ohio, 1970s Tsunami inundation maps of Seward and northern Resurrection Bay, Alaska Tsunami inundation maps of Fox Islands communities, including Dutch Harbor and Akutan, Alaska Tsunami inundation maps of Seward and northern Resurrection Bay, Alaska Tsunami inundation maps of Fox Islands communities, including Dutch Harbor and Akutan, Alaska