| start date | end date | title | description | icon | date limit | importance |
link | modal |
|---|
| 1795-00-00 | | Westdahl: 1795 | From Miller and others (1998): "Veniaminov (1840, p. 18) described an eruption in 1795 on the southwest end of Unimak Island, which most likely occurred at Westdahl. Coats (1950) attributed four eruptions in the late eighteenth century and early nineteenth century to Pogromni volcano. Based on recent observations from aircraft, however, Pogromni does not appear to have been active in historical time. The eruptions should probably be assigned to Westdahl."
From Veniaminov (1840, translated ... More information | exclamation.png | ye | 50 | http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Westdahl&eruptionid=271&page=basic | |
| 1796-00-00 | | Westdahl: 1796 | From Miller and others (1998): "Coats (1950) attributed four eruptions in the late eighteenth century and early nineteenth century to Pogromni volcano. Based on recent observations from aircraft, however, Pogromni does not appear to have been active in historical time. The eruptions should probably be assigned to Westdahl."
Sapper (1917) reports that in 1796 ice and water came pouring down to a town called Nosowskoi. Coats (1950) reports a lava flow or plug dome and some explosive activity.
Simkin ... More information | exclamation.png | ye | 50 | http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Westdahl&eruptionid=272&page=basic | |
| 1820-00-00 | | Westdahl: 1820 | From Miller and others (1998): "Coats (1950) attributed four eruptions in the late eighteenth century and early nineteenth century to Pogromni volcano. Based on recent observations from aircraft, however, Pogromni does not appear to have been active in historical time. The eruptions should probably be assigned to Westdahl."
The eruption of 1820 is a little more confusing, as reports are unclear as to whether the event occurred on Unimak Island (containing the volcanoes of Westdahl, Pogromni, ... More information | asterisk_yellow.png | ye | 50 | http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Westdahl&eruptionid=273&page=basic | |
| 1827-03-00 | 1829-00-00 | Westdahl: 1827 - 1829 | From Miller and others (1998): "Coats (1950) attributed four eruptions in the late eighteenth century and early nineteenth century to Pogromni volcano. Based on recent observations from aircraft, however, Pogromni does not appear to have been active in historical time. The eruptions should probably be assigned to Westdahl."
Grewingk (1850, translated 2003 by Fritz Jaensch) reports that Isenbeck said that Pogromnaia was belching fire in 1827, and "Lastly, on the southern side of Unimak, ... More information | exclamation.png | ye | 50 | http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Westdahl&eruptionid=274&page=basic | |
| 1830-00-00 | | Westdahl: 1830 | From Miller and others (1998): "Coats (1950) attributed four eruptions in the late eighteenth century and early nineteenth century to Pogromni volcano. Based on recent observations from aircraft, however, Pogromni does not appear to have been active in historical time. The eruptions should probably be assigned to Westdahl."
Petroff (1884) reports an eruption in autumn of 1830, but Grewingk (1850, translated 2003 by Fritz Jaensch) suggests the eruption is from Shishaldin. Becker (1898) ... More information | asterisk_yellow.png | ye | 50 | http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Westdahl&eruptionid=278&page=basic | |
| 1951-07-05 | 1951-7-7 | Westdahl: 1951 | From Miller and others (1998): "Based on recent observations from aircraft, however, Pogromni does not appear to have been active in historical time. The eruptions should probably be assigned to Westdahl."
Jones (1952) reports that an officer of one of the TAKL ships reported that Pogromni volcano was not active on July 2, but it was smoking on July 5 to 7. | exclamation.png | ye | 50 | http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Westdahl&eruptionid=275&page=basic | |
| 1964-03-10 | 1964-4-16 | Westdahl: 1964 | Juergen Kienle's compiled notes on file at the Geophysical Institute, University of Alaska Fairbanks, state that Skinner reported in 1979 that during late 1964 to early 1965, 7 separate "blow holes" of ash on E-W line were active at Westdahl. He also states that across a plateau south of Pogromni, just before it slopes off to Bering Sea, there was activity for 1 week, there was a deep gully connecting all blow holes in snow field, and at the end of the week, the main fissure had completely stopped, ... More information | exclamation.png | ye | 50 | http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Westdahl&eruptionid=276&page=basic | |
| 1978-02-04 | 1978-2-9 | Westdahl: 1978 | Around 1:15 pm on February 4, 1978, Clark (1978) observed "great billowing clouds of steam with a drifting black backdrop that suggested falling ash. * * * This was accompanied by lightning, thunder and the smell of sulphur. * * * By 4:00 pm the cloud had become much broader and dark * * * and Clark observed 'swaths of melting snow coming down the hillside.' By 4:30 pm the ash was thick at Scotch Cap. At 6:45 pm Clark 'experienced hail; small stones. The stones are dark. The ash has actually ... More information | exclamation.png | ye | 50 | http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Westdahl&eruptionid=277&page=basic | |
| 1979-02-08 | 1979-2-9 | Westdahl: 1979 | From Pamenter and Kienle (1981): "Ash cloud about 8 km high. "A cloud apparently erupted from Westdahl was present on NOAA weather satellite imagery for more than 30 hours on 8 and 9 February. The cloud was first observed on an infrared image taken at 03:52 on 8 February, about 17 hours after the previous image, on which no eruption cloud could be seen. It occurred on 08:42 and 10:37 (infrared) but was not present at 19:58 on the 9th of 09:52 on the 10th. The cloud was no more than 50 km in ... More information | asterisk_yellow.png | ye | 50 | http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Westdahl&eruptionid=279&page=basic | |
| 1991-11-29 | 1992-1-15 | Westdahl: 1991 - 1992 | McGimsey and others (1995): ""A steam and ash cloud rising to more than 6 km above Westdahl volcano [see fig. 36-1 in original text] was first reported by commercial pilots on routine flights along the Aleutian Island chain on November 29, 1991 (BVE no. 31, p. 83-86). The next day, pilots reported eruptive activity along an 8-km-long fissure that extended from Westdahl Peak northeastward across the glaciated summit area [see fig. 36-2 in original text]. Many pits, craters, and gaping cracks ... More information | exclamation.png | ye | 50 | http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Westdahl&eruptionid=280&page=basic | |
| 1996-03-01 | | Westdahl: 1996 | ... More information | information.png | ye | 50 | http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Westdahl&eruptionid=580&page=basic | |
| 2004-01-07 | | Westdahl: 2004 | From Neal and others (2005): "On January 7, 2004, 90 earthquakes occurred over a period of 12 hours beneath Westdahl Volcano on Unimak Island in the eastern Aleutians. Since the short-period seismic network was installed on this volcano in 1998, the majority of background seismicity has occurred in the vicinity of Faris Peak, a young, intracaldera cone 4 km (2.5 mi) east-northeast of Westdahl Peak (fig. 21B.) The 2004 swarm consisted of earthquakes ranging in size from ML (local or Richter magnitude) ... More information | information.png | ye | 50 | http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Westdahl&eruptionid=549&page=basic | |
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