Effects of the 1995-96 Ruapehu eruptions: has the seismicity changed?
Authors: CJ Bryan and S Sherburn, IGNS
Paper number: 4587 (EQC 99/377)
Technical Abstract
High quality seismic data were collected on Ruapehu volcano in 1994 and 1998. These data bracketed the 1995-96 eruptions, the largest eruptions of Ruapehu in 50 years.
Analysis of these data showed a clear difference in the frequency content of some of the seismic signals. In particular, a new low-frequency signal in some of the earthquakes and tremors was observed in 1998. This new signal, which probably first appeared during or soon after the 1995-96 eruptions, remains as of this time (May 2000).
It most likely resulted from changes in the volcanic plumbing system and has significant implications for forecasting and real-time assessment of future eruptive activity at Ruapehu.
Order a research paper
Many of these research papers have PDF downloads available on the site.
If you'd like to access a paper that doesn't have a download, get in touch to ask for a copy.