Mount Hood

Schichtvulkan 3426 m / 11,240 ft
Oregon, Canada and USA (mainland), 45.37°N / -121.7°W
Aktueller Status: normal / ruhend (1 von 5)
Last update: 8 Jun 2021 (earthquake M 3.9)

Mt Hood 75 km ESE of Portland is Oregon's highest peak and one of the most prominent of the Cascades volcanoes. It is probably the only volcano in Oregon which has erupted in historic times (last confirmed activity in 1865-66).
Andesite-dacite lava domes form the glacially eroded summit complex.
The main hazard from Mt Hood are posed by pyroclastic flows and mud flows (lahars) in case of an eruption. These would travel downstream river beds radiating from the volcano and threaten communities in this area.
Flank failure and debris avalanche risk:
Scientist also warn that due to heavy alteration of rocks by fumarolic and hydrothermal activity large parts of the upper volcanic edifice are structurally unstable and could be prone to massive slope failure. This would trigger catastrophic debris flows, such as has happened at Mt St. Helens in 1980 and have happened in Mt Hood's geologic past as well. More than 100,000 years ago, a large collapse produced a debris avalanche and lahar that traveled north down the Hood River valley and crossed the Columbia River, and a smaller, but still sizeable event like this repeated itselfa about 1500 years ago.

Interaktive Karte zeigen
Typische Tätigkeit: Explosiv
Ausbrüche: 1907(?), 1869(?), 1865-66, 1859, 1854(?), 1853(?), 1795 ± 5 yr, 1765 ± 5, 390 ± 150, 510 AD ± 150, 300 AD ± 200, 4940 BC ± 150

ZeitStärke / TiefeEntfernung / Lage
Wed, 4 Aug 2021 (GMT) (1 earthquake)
4 Aug 2021 11:16:52 GMT
0.6

1.9 km
1.2 km (0.7 mi)
7 Km NNE of Government Camp, Oregon
Sat, 31 Jul 2021 (GMT) (1 earthquake)
31 Jul 2021 10:47:36 GMT
0.7

4.9 km
4.1 km (2.5 mi)
6 Km NE of Government Camp, Oregon
Wed, 28 Jul 2021 (GMT) (1 earthquake)
28 Jul 2021 03:46:02 GMT
0.7

2.9 km
1.2 km (0.7 mi)
7 Km NNE of Government Camp, Oregon
Tue, 27 Jul 2021 (GMT) (1 earthquake)
27 Jul 2021 11:46:32 GMT
0.2

5.4 km
2.4 km (1.5 mi)
7 Km NE of Government Camp, Oregon
Sun, 25 Jul 2021 (GMT) (1 earthquake)
25 Jul 2021 01:46:46 GMT
1.2

14 km
28 km (17 mi)
8 Km SE of Cascade Locks, Oregon

Beschreibung

Mt Hood volcano has had at least 4 major eruptive periods during the past 15,000 years. The last three occurred within the past 1800 years from vents high on the SW flank and produced deposits that were distributed primarily to the south and west along the Sandy and Zigzag rivers. The last eruptive period took place around 170-220 years ago, when growth of the Crater Rock lava dome was accompanied by pyroclastic flows and lahars down the White and Sandy rivers. The Sandy River lahar deposits extended to the west as far as the Columbia River and were observed by members of the 1804-1805 Lewis and Clark expedition within a few years of their emplacement. Minor 19th-century eruptions were witnessed from Portland.
About 1,500 years ago, a moderate-size debris avalanche originating on the upper southwest flank of Mount Hood (see photograph) produced a lahar
that flowed down the Zigzag and Sandy River valleys. It swept over the entire valley floor in the Zigzag-Wemme-Wildwood area, and inundated a broad area near Troutdale, where the Sandy flows into the Columbia River—a total distance of about 90 kilometers (55 miles). More than 100,000 years ago, a much larger debris avalanche and related lahar flowed down the Hood River, crossed the Columbia River, and flowed several kilometers up the White Salmon River on the Washington side. Its deposit must have dammed the Columbia River at least temporarily.
---
Sources:
GVP Mt Hood information
VOLCANO HAZARDS IN THE MOUNT HOOD REGION, OREGON USGS Open File Report 97-89


Siehe auch: Sentinel hub | Landsat 8
Mehr zeigen
App herunterladen
Volcanoes & Earthquakes - new app for Android
Android | iOS Version

Mehr auf VolcanoDiscovery

Warum gibt es Werbung auf dieser Seite?
Unterstützen Sie unsere Arbeit!
Diese Webseite und die dazugehörigen Apps und Tools instandzuhalten und kostenlos Nachrichten zu Vulkanen, Erdbeben und anderen Themen bereitzustellen, verschlingt enorm viel Zeit und auch Geld.
Wenn Sie die Infos mögen und uns in der Arbeit dazu unterstützen wollen, würden wir uns über eine Spende (über PayPal oder mit Kreditkarte) sehr freuen.
Online Zahlung (Kreditkarte)
Damit können wir Ihnen auch in Zukunft neue Features entwickeln und Bestehende laufend verbessern.Vielen Dank!
Copyrights: VolcanoDiscovery und andere Quellen wie angegeben.
Verwendung von Bildern: Text und Fotos auf dieser Webseite sind urheberrechtlich geschützt. Weitere Verwendung und Kopieren ohne vorherige Genehmigung ist untersagt. Wenn Sie Fotos für private oder gewerbliche Zwecke nutzen wollen, kontaktieren Sie uns bitte.