How does an earthquake affect the GNSS time-series and/or positioning?

04 December 2022 4 1K Report

Major earthquake events can cause ground deformation which can be detectable by GNSS. After a large event, GNSS data can even be used to improve moment magnitude estimations.

For smaller magnitude events, I was wondering what would be the threshold for magnitude/distance from the earthquake source that we can detect the earthquake's coseismic (+postseismic signal) signature on the GNSS time series.

On Nevada Geodetic Laboratory website (http://geodesy.unr.edu/NGLStationPages/stations/LEMN.sta), I saw this formula: "10^(M/2 - 0.79)", we input magnitude (M) to obtain distance value (km). If the distance between the GNSS station and the earthquake epicenter is less than the value we obtained from the formula, it is possible to see a step record on the GNSS time series.

I would really appreciate it if someone could recommend some papers related to this topic.

László Attila Horváth

Dear Yağızalp Okur ,

Here is an article:

Preprint PREDICTION OF RARE EVENTS AND PHENOMENA

Perhaps onto base of formula used by article writer you can create a formula useful for you... same see the critics of the forecasting method:

Article A 2019. júliusi nankai földrengés

You really have to pay attention to the geological structure of the zone... as is written in the article

Regards,

Laszlo

P.S: you also can visit the next discussion:

https://www.researchgate.net/post/Exists-the-next-situation-when-an-outsider-researcher-who-has-achieved-a-very-encouraging-result-in-earthquake-forecasting-is-not-supported

https://www.researchgate.net/post/How-do-You-see-the-Earthquakes-Prediction-Forecast-or-Random-events

If you want to organize an Earthquake forecast for the Turkish region, I would be happy to help you...

Vladimir Kaftan

Dear Yağızalp Okur, what do you want exactly? You know the good formula of the Nevada Geodetic Laboratory. What else? Ризниченко Ю.В. Проблемы сейсмологии. Избранные труды. М. "Наука" 1985 с. 19-23. It is the article of the Russian geophysicist Riznichenko. He find that the magnitudes of the surface seismic ruptures for different M are aproximately M7 - meters, M6 - decimetres, M5 - centimetres. So for M4 GNSS can see nothing. This regularity was proved many times by geodesists. I work on GNSS usage for the seismic deformation registration and do/can not study events M

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