Thermal surveillance of active volcanoes using the LANDSAT-1 data collection system. Part IV. Lassen volcanic region. Final report 1972--1975
The author has identified the following significant results. Analysis of LANDSAT 1 MSS images of October 6, 24, and 25 1972 of the Lassen volcanic region, California, revealed the existence of three large geomorphic rings between Lassen Peak and Lake Almanor. Ring 1, about 16 x 33 km and 490 sq km in area, was centered on the North Branch of the North Fork of the Feather River. Ring 2, 18 x 20.5 km and 300 sq km in area, was concentric to and enclosed by ring 1. Ring 3, 23 x 11 km and 230 sq km in area, was centered on Butt Mountain and cuts ring 1 on the south. All three rings consisted of composite curvilineaments that represent geologic features of two categories: (1) geologically mapped structures and volcanic landforms, and (2) landforms and lines of geomorphic origin that were inferred to represent the surface expression of subsurface structures. Stream-valley and lake-shoreline continuations of mapped faults, escarpments, and aligned segments of stream valleys were included in the 2nd category. The rings overlap a gravity low 5300 sq km in area, and might be the surface expression of volcano tectonic collapse structures that followed eruption of voluminous ash flow tuffs beggining in Miocene time.
- Research Organization:
- Geological Survey, Denver, CO (USA)
- OSTI ID:
- 6766125
- Report Number(s):
- E-78-10123
- Country of Publication:
- United States
- Language:
- English
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