File:Gates of Okmok.jpg
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Summary
editDescriptionGates of Okmok.jpg |
English: Okmok volcano occupies most of northeastern Umnak Island, in the eastern Aleutian Islands, Alaska. The last eruption of Okmok started on July 12, 2008 as an explosion eruption. The opening explosions consumed a portion of intracaldera Cone D within the east-central sector of the caldera, reaming several new craters into the caldera floor. Eruptive activity began only a few hours after a subtle increase in the rate of earthquakes followed by a short swarm sequence, both noted only in retrospect.
Over the next 5 weeks, several hundred million cubic meters of tephra and lahar deposits blanketed much of northeast Umnak Island. Within the caldera, nearly continuous hydrovolcanic explosions accumulated many tens of meters of wet, mostly fine-grained tephra. Explosive activity completely disrupted existing groundwater and standing water bodies within the caldera, formed new lakes, and constructed a new tephra cone about 100-200 m (330-660 ft) high. Photo: Janet Schaefer, Aug 11, 2013. Learn more about Okmok at bit.ly/okmok
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Date | |
Source | https://www.flickr.com/photos/27784370@N05/14271019373/ |
Author | U.S. Geological Survey |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot SD890 IS |
Exposure time | 1/200 sec (0.005) |
F-number | f/3.2 |
ISO speed rating | 80 |
Date and time of data generation | 12:00, 11 August 2013 |
Lens focal length | 6.6 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop CS2 Windows |
File change date and time | 07:35, 12 August 2013 |
Y and C positioning | Centered |
Exif version | 2.2 |
Date and time of digitizing | 12:00, 11 August 2013 |
Meaning of each component |
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Image compression mode | 5 |
APEX shutter speed | 7.65625 |
APEX aperture | 3.34375 |
APEX exposure bias | 0 |
Maximum land aperture | 3.34375 APEX (f/3.19) |
Metering mode | Pattern |
Flash | Flash did not fire, auto mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 15,136.929460581 |
Focal plane Y resolution | 15,116.022099448 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Supported Flashpix version | 1 |
Image width | 3,648 px |
Image height | 2,736 px |
Date metadata was last modified | 23:35, 11 August 2013 |