Studies from Uppsala University Have Provided New Information about Geology

NewsRx Science Daily

2020 MAR 09 (NewsRx) -- By a News Reporter-Staff News Editor at NewsRx Science Daily -- Research findings on Geology are discussed in a new report. According to news reporting out of Uppsala, Sweden, by NewsRx editors, research stated, “Here, all three components of the seismic signal are applied for use with the amplitude source location (ASL) method to investigate if using all three components yield more accurate results than using just the vertical component. Eight active source events along a debris flow channel on Te Maari Volcano, New Zealand, are used as known source locations to conduct the test.”

Funders for this research include New Zealand Ministry of Business, Innovation and Employment (MBIE), Massey University Dissemination Grant, Centre of Natural Hazards and Disaster Science fellowship, MBIE Strategic Science Investment Fund (SSIF).

Our news journalists obtained a quote from the research from Uppsala University, “Both coda-wave normalization (CWN) and horizontal-to-vertical (HN) ratio methods are used to calculate amplification factors for station corrections. Average location errors for all the active seismic sources varied between 0.47 km for the vertical component and 0.51 km for three components while using the CWN method, and 0.92 km (vertical) and 0.83 km (three component) using the H/V method. We also conduct statistical analysis through an F-test by calculating root mean square errors (RMSEs) to determine if the results were statistically different. The RMSE analysis for the active source events shows location results for event 1 and 7 producing errors of 2.18 +/- 1.33 and 2.37 +/- 1.29 km for the vertical-component results, and 2.06 +/- 1.16 and 2.33 +/- 1.24 km for the three-component results. The F-test indicates that active source events higher up the debris flow channel (centrally located relative to the network) are statistically the same, whereas events lower down the channel (away from the center of the network) are statistically different.”

According to the news editors, the research concluded: “Results show that using all three components with the ASL method may not necessarily yield more accurate locations, but nevertheless may average the components to eliminate the extreme error values or amplify the signals, producing more precise results.”

For more information on this research see: Improving the Amplitude Source Location (Asl) Method Using Multicomponent Seismic Data: an Assessment With Active Source Seismic Data. Bulletin of the Seismological Society of America, 2020;110(1):250-269. Bulletin of the Seismological Society of America can be contacted at: Seismological Soc Amer, 400 Evelyn Ave, Suite 201, Albany, CA 94706-1375, USA.

Our news journalists report that additional information may be obtained by contacting B. Walsh, Uppsala University, Dept. of Earth Sciences, Uppsala, Sweden. Additional authors for this research include J. Procter and A. Jolly.

The direct object identifier (DOI) for that additional information is: https://doi.org/10.1785/0120190063. This DOI is a link to an online electronic document that is either free or for purchase, and can be your direct source for a journal article and its citation.