isoseismal


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isoseismal

[¦ī·sə′sīz·məl]
(geophysics)
Pertaining to points having equal intensity of earthquake shock, or to a line on a map of the earth's surface connecting such points.
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The isoseismal maps of next destructive Vrancea earthquakes on 30 August 1986 (Mw=7.1 according to ROMPLUS) and 30 May 1990 (Mw=6.9, ROMPLUS), containing intensity data points, are presented by Evlogiev et al.
More than 150 isoseismal maps or maps with intensity data points compiled in Bulgaria were published in atlases and studies.
Based on DIM, a mathematical interpolation method has been proposed to draw isoseismal line by using these discrete intensity values.
Although isoseismal line has realized the conversion from discrete intensity values to continuous ones, however, it is still discrete between the lines.
Time (U.T.) Latitude Longitude Date hr:min:sec [degrees]N [degrees]W May 22,1817 7:45 45.0 67.2 February 08, 1855 7:03 46.0 64.5 October 22, 1869 9:55 46.5 67.0 March 21, 1904 6:04 45.0 67.2 July 2, 1922 9:22 46.5 66.6 September 30, 1937 7:58:10 47.4 66.3 Felt area Isoseismal IV Date magnitude (1) magnitude (1) May 22,1817 4.6 5.4 February 08, 1855 4.8 5.4 October 22, 1869 5.3 6.0 March 21, 1904 5.3 6.0 July 2, 1922 4.7 5.4 September 30, 1937 4.5 * -- Date Su Sub-zone May 22,1817 Passamaquoddy Bay February 08, 1855 Moncton region October 22, 1869 Central Highlands March 21, 1904 Passamaquoddy Bay July 2, 1922 Central Highlands September 30, 1937 Central Highlands Notes: (1) Values determined by relationships between magnitude and felt area (Burke 2009).
Figure 4 represents the first isoseismal map (No 44 in Table 22).
It had 15 aftershocks and two foreshocks and isoseismals were drawn up (No 43 in Table 22).
LINKIMER, L (in press): Application of the kriging method to draw isoseismal maps of the significant 2002-20033 Costa Rican earthquakes.--Rev.
In Figure 5 their isoseismal map for the meizoseismal zone is shown.
Later, especially for the compilation of macroseismic data, several authors presented other isoseismal maps for this earthquake: (i) Mezcua (1982) published a map that covers the whole Iberian Peninsula, which is mainly based on the original map of Choffat and Bensaude (1912) with slight modifications; (ii) Senos et al.
Rothe (1955) reported the generation of surface breaks around the Beni Rached zone, which is an important deformation (offset) along the 4.5-km segment of the Algiers-Oran railway, and published an isoseismal map with a recorded intensity of [I.sub.o]=X in the El Asnam region.