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Solid Earth An interactive open-access journal of the European Geosciences Union

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doi:10.5194/se-2016-150
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
09 Nov 2016
Review status
A revision of this discussion paper was accepted for the journal Solid Earth (SE) and is expected to appear here in due course.
Path and site effects deduced from transfrontier internet macroseismic data of two recent M4 earthquakes in NW Europe
Koen Van Noten1, Thomas Lecocq1, Christophe Sira2, Klaus-G. Hinzen3, and Thierry Camelbeeck1 1Royal Observatory of Belgium, Seismology - Gravimetry, Ringlaan 3, B-1180 Brussels, Belgium
2French Central Seismological Office, University of Strasbourg, Rue René Descartes 5, 67084 Strasbourg Cedex, France
3University of Cologne, Bensberg Erdbebenstation,Vinzenz - Pallotti - Stasse 26, D-51429 Bergisch Gladbach, Germany
Abstract. The online collection of earthquake testimonies in Europe is strongly fragmented across numerous seismological agencies. This paper demonstrates how collecting and merging “Did You Feel It?” (DYFI) institutional macroseismic data strongly improves the quality of real-time intensity maps. Instead of using ZIP code Community Internet Intensity Maps we geocode individual response addresses for location improvement, assign intensities to grouped answers within 100 km2 grid cells, and generate intensity attenuation relations from the grid cell intensities. Grid cell intensity maps are less subjective and illustrate a more homogeneous intensity distribution than the ZIP code intensity maps. Using grid cells for ground motion analysis offers an advanced method for exchanging transfrontier equal-area intensity data without sharing any personal’s information. The applicability of the method is demonstrated on the DYFI responses of two well-felt earthquakes: the 8 September 2011 ML 4.3 (MW 3.7) Goch (Germany) and the 22 May 2015 ML 4.2 (MW 3.7) Ramsgate (UK) earthquakes. Both events resulted in non-circular distribution of intensities which is not explained by geometrical amplitude attenuation alone but illustrates an important low-pass filtering due the sedimentary cover above the Anglo-Brabant Massif and in the Lower Rhine Graben. Our study illustrates the effect of increasing bedrock depth on intensity attenuation and the importance of the WNW-ESE Caledonian structural axis of the Anglo-Brabant Massif on seismic wave propagation: seismic waves are less attenuated – high Q – along the strike of the massif but are stronger attenuated – low Q – perpendicular to this structure, especially when they cross rheologically different seismotectonic units that are separated by crustal-rooted faults.

Citation: Van Noten, K., Lecocq, T., Sira, C., Hinzen, K.-G., and Camelbeeck, T.: Path and site effects deduced from transfrontier internet macroseismic data of two recent M4 earthquakes in NW Europe, Solid Earth Discuss., doi:10.5194/se-2016-150, in review, 2016.
Koen Van Noten et al.
Koen Van Noten et al.

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Short summary
Every person is a seismometer. By using the people’s testimonies submitted online to European seismological agencies we made new grid cell shaking intensity maps of the 2011 Goch (DE) and 2015 Ramsgate (UK) M4 earthquakes. Both events were widely felt in NW Europe and had non-concentric shaking intensity patterns which are strongly linked to the bedrock depth in the felt area. Storing intensity data in grid cells is a promising tool for seismological agencies to share intensity data anonymously.
Every person is a seismometer. By using the people’s testimonies submitted online to European...
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