scholarly journals Evaluation of 1947-1993 macroseismic information in Portugal using the EMS-92 scale

1996 ◽  
Vol 39 (5) ◽  
Author(s):  
A. Paula ◽  
C. S. Oliveira

In the present work macroseismic information of the earthquakes felt in Continental Portugal from 1947 to 1993 was evaluated using the EMS-92 intensity scale. Press information, and data in the seismological questionnaires used in this period of time, were used as prime information. Prior intensity assignments were also used in the analysis. Two methodologies -A and B -were followed, according to the type of information available: A) whenever seismological questionnaires or descriptions of effects are accessed this information was analysed leading to an intensity value and to an intensity quality factor; this methodology includes a standardisation of questionnaire evaluation, through the use of conversion keys; B) if only an intensity assignment, in any known scale, existed, then a conversion of intensities was made. The results of these two methodologies are compared and discussed. Based on the above mentioned information a database with 1947-1993 Portuguese seismic information was built up, and a few features of its contents were discussed.


2021 ◽  
Author(s):  
M Lamontagne ◽  
P Archambault ◽  
S Halchuk

This Open File Report provides the available macroseismic information for the seven largest moderate earthquakes that occurred in the Charlevoix Seismic Zone between 1870 and 2021. These earthquakes and their moment magnitude (M) are: 1) February 3, 1902, M 4.5; 2) September 30, 1924, M 5.2; 3) January 08, 1931, M 4.9; 4) October 19, 1939, M 5.3; 5) October 14, 1952, M 4.5; 6) August 19, 1979, M 4.8; 7) March 6, 2005, M 4.7. Five, possibly six, of these seven earthquakes occurred in the northeast portion of the CSZ, where the largest event of the period, the 1925 M 6.2 earthquake, also occurred. For each locality where the earthquakes were felt, macroseismic information is given and interpreted on the Modified Mercalli Intensity Scale. The original mail questionnaires filled by postmasters for earthquakes no. 3, 4, 5 and 6 are lost. Consequently, the main sources of information are the newspaper accounts except for no. 7 for which web-based questionnaires are available. The macroseismic information from localities in Canada and in the US (from NOAA) are tabulated in Microsoft Excel spreadsheets. Most newspaper clippings that have macroseismic information are included. The Open File also provides Google Earth kmz files that allow the felt information reports to be viewed in a spatial tool.



Author(s):  
James R. Thompson ◽  
Brian R. Bryant ◽  
Edward M. Campbell ◽  
Ellis M. Craig ◽  
Carolyn M. Hughes ◽  
...  


Author(s):  
Maggie Geuens ◽  
Patrick de Pelsmacker


2010 ◽  
Author(s):  
Calvin Kai-Ching Yu
Keyword(s):  


1988 ◽  
Vol 49 (C8) ◽  
pp. C8-1947-C8-1948
Author(s):  
J. Miltat ◽  
P. Trouilloud


Author(s):  
V. N. Zima ◽  
◽  
T. N. Torgash ◽  
A. G. Kozlov ◽  
◽  
...  


2014 ◽  
Vol 134 (2) ◽  
pp. 26-31 ◽  
Author(s):  
Nguyen Van Toan ◽  
Masaya Toda ◽  
Yusuke Kawai ◽  
Takahito Ono


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