• Organization: Department of the Interior
• Updated: 2021-10-26T00:00:00Z

Text files: These data are text files of GNSS survey points collected along a trace of the West Napa Fault Zone near Ehlers Lane north of St. Helena, California. Data were collected to aid in...

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• Organization: National Oceanic and Atmospheric Administration, Department of Commerce
• Updated: 2012-02-01T00:00:00.000+00:00

Location: almost directly beneath Helena. Affected area: 363,000 square kilometers. Damage: $4 million. A series of earthquakes beginning on October 3, 1935, shook the area. The strongest of the...

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• Organization: National Oceanic and Atmospheric Administration, Department of Commerce
• Updated: 2021-01-01T00:00:00.000+00:00

These data were automated to provide an accurate high-resolution historical shoreline of St. Helena Sound to Savannah River, SC suitable as a geographic information system (GIS) data layer. ...

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• Organization: National Oceanic and Atmospheric Administration, Department of Commerce
• Updated: 2021-01-01T00:00:00.000+00:00

These data were automated to provide an accurate high-resolution historical shoreline of Bulls Bay to St. Helena Sound, SC suitable as a geographic information system (GIS) data layer. These...

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• Organization: National Oceanic and Atmospheric Administration, Department of Commerce
• Updated: 2022-01-01T00:00:00.000+00:00

These data provide an accurate high-resolution shoreline compiled from imagery of St Helena Sound to Kiawah Island, SC . This vector shoreline data is based on an office interpretation of...

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• Organization: National Oceanic and Atmospheric Administration, Department of Commerce
• Updated: 2020-01-01T00:00:00.000+00:00

These data provide an accurate high-resolution shoreline compiled from imagery of St. Helena Sound to Port Royal Sound, South Carolina . This vector shoreline data is based on an office...

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• Organization: Department of the Interior
• Updated: 2020-08-27T00:00:00Z

In September 2017, the U.S. Geological Survey acquired high resolution P- and S-wave seismic data across the suspected trace of the West Napa Fault zone in St. Helena, California, approximately 70...

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• Organization: National Oceanic and Atmospheric Administration, Department of Commerce
• Updated: 1998-06-06T00:00:00.000+00:00

Bathymetry for St. Helena Sound was derived from nineteen surveys containing 83,246 soundings. No surveys were omitted. The average separation between soundings was 49 meters. Sixteen of the...

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• Organization: National Oceanic and Atmospheric Administration, Department of Commerce
• Updated: 2020-01-01T00:00:00.000+00:00

These data provide an accurate high-resolution shoreline compiled from imagery of Coosaw River, St Helena Sound to Chisholm Islands, SC . This vector shoreline data is based on an office...

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• Organization: U.S. Census Bureau, Department of Commerce
• Updated: 2023-10-01T00:00:00.000+00:00

The TIGER/Line shapefiles and related database files (.dbf) are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically...

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• Organization: U.S. Census Bureau, Department of Commerce
• Updated: 2025-10-01T00:00:00.000+00:00

The TIGER/Line shapefiles and related database files (.dbf) are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically...

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• Organization: U.S. Census Bureau, Department of Commerce
• Updated: 2023-10-01T00:00:00.000+00:00

The TIGER/Line shapefiles and related database files (.dbf) are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically...

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• Organization: U.S. Census Bureau, Department of Commerce
• Updated: 2024-10-01T00:00:00.000+00:00

The TIGER/Line shapefiles and related database files (.dbf) are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically...

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• Organization: U.S. Census Bureau, Department of Commerce
• Updated: 2025-10-01T00:00:00.000+00:00

The TIGER/Line shapefiles and related database files (.dbf) are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically...

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• Organization: U.S. Census Bureau, Department of Commerce
• Updated: 2024-10-01T00:00:00.000+00:00

The TIGER/Line shapefiles and related database files (.dbf) are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically...

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• Organization: U.S. Census Bureau, Department of Commerce
• Updated: 2023-10-01T00:00:00.000+00:00

The TIGER/Line shapefiles and related database files (.dbf) are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically...

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• Organization: Department of the Interior
• Updated: 2020-08-27T00:00:00Z

In April 2017, the U.S. Geological Survey acquired high resolution P- and S-wave seismic data across the suspected trace of the West Napa Fault zone in St. Helena, California. We acquired seismic...

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• Organization: U.S. Census Bureau, Department of Commerce
• Updated: 2025-10-01T00:00:00.000+00:00

This resource is a member of a series. The TIGER/Line shapefiles and related database files (.dbf) are an extract of selected geographic and cartographic information from the U.S. Census Bureau's...

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• Organization: U.S. Census Bureau, Department of Commerce
• Updated: 2022-08-01T00:00:00.000+00:00

The TIGER/Line shapefiles and related database files (.dbf) are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically...

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• Organization: U.S. Census Bureau, Department of Commerce
• Updated: 2022-08-01T00:00:00.000+00:00

The TIGER/Line shapefiles and related database files (.dbf) are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically...

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