File:Dacite pumice (15 June 1991 eruption of Mt. Pinatubo, Luzon Volcanic Arc, western Luzon Island, northern Philippines) 2.jpg
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[edit]DescriptionDacite pumice (15 June 1991 eruption of Mt. Pinatubo, Luzon Volcanic Arc, western Luzon Island, northern Philippines) 2.jpg |
English: Dacite pumice (air-fall tephra) from the late Holocene of the Philippines. (3.5 cm across at its widest)
Located near the western margin of Luzon Island in the northern Philippines, Mt. Pinatubo is one of several subduction zone stratovolcanoes in the Luzon Volcanic Arc. Published information indicates that Pinatubo is >35,000 years old and is composed principally of dacitic and andesitic rocks. Mt. Pinatubo had a large explosive ash eruption in 1991 that was the largest anywhere on Earth since 1912. Pinatubo's eruption is also famous for having been successfully predicted by American volcanologists. The prediction and subsequent evacuation saved thousands of lives. The mid-June 1991 eruptions from Pinatubo blanketed ash, pumiceous lapilli, and pumice over the surrounding countryside, including two American military bases (Clark and Subic Bay). The sample shown above is dacite pumice from the 15 June 1991 eruption - it was collected at the U.S. Subic Bay Naval Base, ~20 miles south of Mt. Pinatubo. For additional geologic information on the 1991 Pinatubo eruption, see: Newhall & Punongbayan (1996) - Fire and Mud, Eruptions and Lahars of Mount Pinatubo, Philippines. Quezon City & Seattle & London. Philippine Institute of Volcanology and Seismology & University of Washington Press. 1126 pp. |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/14839450940/ |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/14839450940. It was reviewed on 20 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
20 October 2020
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 01:48, 20 October 2020 | 1,873 × 1,024 (662 KB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/14839450940/ with UploadWizard |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D70s |
Exposure time | 1/800 sec (0.00125) |
F-number | f/7.1 |
ISO speed rating | 200 |
Date and time of data generation | 16:22, 4 May 2006 |
Lens focal length | 105 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 21:06, 24 August 2014 |
Exposure Program | Normal program |
Exif version | 2.21 |
Date and time of digitizing | 16:22, 4 May 2006 |
Image compression mode | 4 |
APEX exposure bias | −0.33333333333333 |
Maximum land aperture | 3.5 APEX (f/3.36) |
Metering mode | Spot |
Light source | Tungsten (incandescent light) |
Flash | Flash did not fire |
DateTime subseconds | 90 |
DateTimeOriginal subseconds | 90 |
DateTimeDigitized subseconds | 90 |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Manual white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 157 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Hard |
Saturation | Normal |
Sharpness | Soft |
Subject distance range | Unknown |
Supported Flashpix version | 1 |
Image width | 1,873 px |
Image height | 1,024 px |
Date metadata was last modified | 17:06, 24 August 2014 |