catalogo de terremotos para america del sur catalog of earthquakes ...

I4/4
For the instrumental period, prior to 1963, one can rely on the depth
only for destructive events; thi s parameter is stiil very much under study.
Magn i tud c
The seismic mnasnitude appears in four coluns. Magnittude b is the magnitude
calculited with the ,o v.w v;. The mb magnitude, Ient:ified with IGI
or DII, his h,,en clcilatid, iusing n i;nogr;bms from iluancwo and ha Paz (Bhol.i.via)
to eUirite tie ;I irtion finction ( ... ) and the tables given by Duda
(1970)). Ti.o events for, which tilhe .mrr iGP appears, were puiblished in seve­
"
r11 rpi , lilIcl t A .IY) d, t ;hoseid.unL ified bv I.!!H, belon g to a
series of 1!I'p1 li hu 1d dita cIlcul t(I Ar tlh author. For dates aft.Ler 1963,
te v nrn v X: U,4 oi L;taken. Ab lrepresents the magnitude calculated
W.'it I I:f'., ,.e \I%, . CA ur ,1,(, I in fer Lhe body wave magnit ude wii ch ls a
lessi r i n." t' thanl m or ,which h'is. teen 11ita Us.ini, the level of
dvt
pni~p'
tio (ANN, I x. ,o tr5 l. ; :!, l aglnitude Mis i ven for ei.i.inee0-inu;
"io rJ mnt 1 nw :ome Ctrt Oki, Ah or the Macrosei, isic magpitud-.
, 1. Ift ii. ',:r :. Inhe Ms >the toil ;1 ', rre tcr accuric:', with two deci.mals, is
n' i+v.,- n. i t i ' P: dt to n.v.' r: io f r "".: n!)bt o+ t:, h i s hta s b e e n d o n et u sq i n g-H tu ac o 's
forrmula wlris
A> 1)+
Vtic r' formul;i, s;pec ially , foril+a NAM; 1.10 0./123 Ms. Preference has been given to this
for Stro ' events, does not yield
-it X: vli 5 with ... ,' the onp oht ined by directv measuring the nurface
wiv, .
C;rthquaki.e ,
",r exa ile,
1o ',,nittide
for a dit-trut livu event such as the Peru 31 May 1970
;easured are mh - 6.6 and Ms - 7.8. With Richter's
form2:la, the ,i - m. - ; f. c r( . m tids to a val1ue of Ms - 6.5; with Hiuaco's
formula1 an1 X, -:7.7" in ( ill(i (. ich is, close to the observed value.
Fei Lh,. pu-." e if q a;t il-,ing the historical events, the Macroseismic
>:li;nitHdu Yv. h ,-,n i t 'rin icpd, (n tLb basis of the Intensity and the area
of o'bser-vt ion. In order t" (a:lit d Mm and to discriminate between shallow
and intermediatte de;pthIov'lt s, tile formutla of litaco-Rodriguez (1983) has been
u;ed: :. - ii. lo.+ in7+ impo (hi) + 0.75156 for depths 0 < Y < 33 km ;
;n1( ,is - !no7 - '°. if, 1! ,.n (h) 4 1 .,2346 for depths 33