Author : Donald A. Swanson
Publisher : Forgotten Books
ISBN 13 : 9781390925739
Total Pages : 50 pages
Book Rating : 4.9/5 (257 download)
Book Synopsis Displacement of the South Flank of Kilauea Volcano by : Donald A. Swanson
Download or read book Displacement of the South Flank of Kilauea Volcano written by Donald A. Swanson and published by Forgotten Books. This book was released on 2018-09-23 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Displacement of the South Flank of Kilauea Volcano: The Result of Forceful Intrusion of Magma Into the Rift Zones Seismic evidence has long indicated that the south flank of Kilauea Volcano is mobile. Examination of triangulation, trilatera tion, and leveling data obtained throughout the 20th century shows that the south flank of Kilauea has been displaced upward and away from the rift zones by as much as several metres. The amount of horizontal displacement approximates the probable amount of dila tion that accompanies the intrusion of magma as dikes in the rift zones and is greatest for periods of most intense intrusive activity, as evidenced by the frequency of eruptions. Displacement and seismic events on the south flank take place soon after intrusive activity, indicating that the displacement is the result of forceful intrusion in the rift zones, not the cause of relatively passive intrusion. The dikes are thought to be nearly vertical or to dip steeply southward, on the basis of both interpretation of seismic and displacement data for Kilauea itself and comparison with dikes exposed in older, eroded Hawaiian shield volcanoes. In contrast to the south flank, seismic and geodetic data indicate that the north flank is virtually immobile. This contrast is believed to reflect the fact that Kilauea was built on the south slope of Mauna Loa and was consequently influenced by the gravitational stress sys tem of Mauna Loa, which favors displacement away from the vol canio edifice. The north flank of Kilauea is effectively buttressed by Mauna Loa, whereas the south flank is unbuttressed and free to move away from the edifice when prompted by forceful intrusion of magma. The active part of the east rift zone of Kilauea has apparently migrated several kilometres southward with time. This is shown by the location of recent vents and by the location of the axis of a posi tive gravity anomaly along the north edge of the active part of the rift zone. The southward migration helps explain several features of the geometry of the east rift zone, particularly its prominent bend near Kilauea Caldera. The southwest rift zone and the caldera also show some evidence of southward migration. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
