RUSSIAN JOURNAL OF EARTH SCIENCES VOL. 8, ES1001, doi:10.2205/2005ES000195, 2006


Reported Parameters for the 1930 Earthquake

2005ES000195-fig02
Figure 2
[8]  We accept as the reference source of information the IGN earthquake catalogue (IGN Database, 2004, http://www.mfom.es/ign/), [Martinez-Solares and Mézcua, 2002; Mézcua and Martinez-Solares, 1983], which is the official catalogue of earthquakes in Spain. The parametric lines for the 2 June, 1930 and 13 February, 1949 earthquakes in the IGN catalogue are shown in Table 1. There are two versions of the isoseismal map for the 1930 earthquake in Mézcua [1982], each referring to different sources of information. Both versions are reproduced in Figure 2. The 1949 earthquake
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Figure 3
map is reproduced in Figure 3 [Mézcua, 1982]. All maps have been re-sized to be approximately in the same scale.

[9]  Even a brief examination of the isoseismal maps reveals some incoherencies. Though magnitudes of the 1930 and 1949 earthquakes are almost the same (3.9 and 4.0), the felt area of the first one is larger. It is also much larger (more than 2 times) the area contoured by the intensity IV isoline (regardless to which version of the isoseismal map of the 1930 earthquake we compare with the 1949 map). This could hardly be attributed to different attenuations of seismic waves radiated by both earthquakes, because the distance between their epicenters is about 20 km, so the source-locality travel paths are almost the same for both earthquakes. An explanation could be the assumption of a deeper source for the 1930 earthquake. But a deeper source of the 1930 earthquake will become in contradiction with equal magnitudes and epicentral intensities ( I0=5 ) for both earthquakes. According to equation (1) and (2), the epicentral intensity, magnitude and felt area of the 1949 earthquake are coherent with the assumption of a relatively shallow source (10-15 km), so the discrepancy between these parameters for the 1930 event has to be solved. For this purpose we have to verify both macroseismic and instrumental data.


RJES

Citation: Tatevossian, R., A. Ugalde, J. Batlló, and R. Maciá (2006), Macroseismic and instrumental data comprehensive analysis: Earthquake of June 2, 1930 in Catalonia (Spain), Russ. J. Earth Sci., 8, ES1001, doi:10.2205/2005ES000195.

Copyright 2006 by the Russian Journal of Earth Sciences

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