Journal cover Journal topic
Advances in Geosciences An open-access journal for refereed proceedings and special publications
Journal topic

Journal metrics

Journal metrics

  • CiteScore value: 1.02 CiteScore 1.02
  • SNIP value: 0.614 SNIP 0.614
  • SJR value: 0.435 SJR 0.435
  • IPP value: 0.97 IPP 0.97
  • h5-index value: 11 h5-index 11
  • Scimago H index value: 32 Scimago H index 32
Volume 45 | Copyright
Adv. Geosci., 45, 235-241, 2018
https://doi.org/10.5194/adgeo-45-235-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

  30 Aug 2018

30 Aug 2018

Investigation of the influence of earthquakes on the water level in the geothermal reservoir of Waiwera (New Zealand)

Michael Kühn1,2 and Tim Schöne1,3 Michael Kühn and Tim Schöne
  • 1Fluid Systems Modelling, GFZ German Research Centre for Geosciences, 14473 Potsdam, Germany
  • 2Earth and Environmental Science, University of Potsdam, 14476 Potsdam, Germany
  • 3Earth Sciences, Freie Universität Berlin, 12249 Berlin, Germany

Abstract. The water level of the Waiwera geothermal reservoir is mainly governed by the production operations due to a commonly strong pumping signal. However, in the hours and days after the Kaikoura earthquake on 14 November 2016, it increased by more than 0.5m, indicating that seismic events can have an influence as well. In a continuous time series consisting of monthly means of water level data and pumping rates starting in 1986, we tried to determine if events above a certain strength alter groundwater dynamics at Waiwera in general. We applied an empirical equation and calculated the on-site seismic energy density from earthquake magnitudes and distances. All recorded earthquakes with a magnitude above 4 within a radius of about 1500km around New Zealand have been taken into account. A clear correlation cannot be proven but none of the recorded earthquakes led to such a high energy density in Waiwera as the Kaikoura event did. For the future, it is recommended to increase the resolution of the metred water production rates to daily averages to improve the detectability of water level changes following earthquakes.

Download & links
Download
Short summary
The water level of the Waiwera geothermal reservoir increased in the hours and days after the Kaikoura earthquake on 14 November 2016. We determined in a continuous time series consisting of monthly means of water level data and pumping rates starting in 1986 if events above a certain strength alter groundwater dynamics at Waiwera. A clear correlation cannot be proven but none of the recorded earthquakes led to such a high energy density in Waiwera as the Kaikoura event did.
The water level of the Waiwera geothermal reservoir increased in the hours and days after the...
Citation
Share