A late quaternary record of geomagnetic secular variation and volcanic activity from Lake Waiau, Hawaii

Author:

Peng, Lei

Title:

A late quaternary record of geomagnetic secular variation and volcanic activity from Lake Waiau, Hawaii

Year:

1991

Volume:

M.S.

Subject:

Volcanoes Geomagnetism secular variations Lake Waiau Lake sediments

Summary:

Lake Waiau is an alpine lake located near the summit of Mauna Kea in Hawaii. Three sediment cores were recovered from Lake Waiau. The sediments mainly consist of three lithological units: volcanic ash layers, lacustrine silt layers, and mixed layers composed of ash and silt. The Waiau sediments provide the first continuous record of geomagnetic secular variation (SV) from Hawaii for the past 13,000 years. The periodic components in the SV were identified using spectral analysis. The hypothesis that there has been anomalously low geomagnetic SV in the central Pacific was tested using angular dispersion analysis. The Waiau sediments also provide records of some of the latest ash-producing eruptions in the area. The geochemical data were analyzed using three statistical methods: similarity-coefficient analysis, cluster analysis and principal component analysis.

Collection:

Monographs