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ADELAIDE OBSERVATORY,
SOUTH AUSTRATIA.
SEISMOLOGICAL BULLETIN.
Prepared under the direotion of
G. F. DODWEIJT, 8.4., F.R.A.S.,
GovmwrrnNr AsrnoNoum.
o.
u".
66'. 3go'.
r. gl.
s.
r4',tt. 19.81'. E.
Height above Mean Sea Level-134 feet.
SITUATION.-5 miles'West of Mount Lofty Ranges, 5 miles East of
^
Sea Coast.
FOIINDATION.-Mar1y Irimestone and Clay of Artelaicle Plains, to depth of 40 feet. Miocene Sandstone
probably below. Depth of bedrocks not known, probably 1,fi)0 to 2,000 feet.
INSTRIIMENTS.-MiIne's Ilorizontal Pendulum, No. 50, 1904 Pattern. E.-W. Component RecordedMilne-Shaw Seismograph, No. 35. N.-S. Component.
Nor.lrror.r.
l. :
II. :
perceptible.
striking.
:
v (vicinus) :
r (remotus) u (ultinus) :
d
(domesticus)
III. :
very striking.
local.
near (Iess than 1000h.).
clistant
(1000h.-5000h.).
very distant (over 5000hm.).
Pslses.
P (prinae)
^
S
(secundss)
I-r (longae)
M (maximae)
C
(aoda)
F
(finis)
PR,l, PR,
sRl,
i
sR2
(impetus)
e (emersio)
E,N
A
E.Q.
: lst prelimina,ry tremors (commencement).
- 2nd preliminary tremors (commencement).
- lrd principal phase, Rayleigh waYes.
: maximum a,mplitutle of L waves.
: a prominent wave among the ttafter tremorg.t'
: last pereeptible movement (non-microseismie).
: lst and 2nd reflected waves of P.
: lst and 2nd reflected waves of S.
: abrupt eoulmencement, clearly defined.
: grad,ual commencemen!, not clearly clefned.
: n-W or N-S component of earth oscillation.
: approximate distance from epieentre in lm.
-
earthquake.
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Perlod 17s.8. SenslolJlty îú.4?o
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M1lne-shaw({-s
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,
QQqnonent
) :erlod. tosrb,
Darnplng ratlo zo:1
lne ( E-',r-IJ3ffi 3i:fi? j *;3ri3 3' t? É . ? s ens rb
*
11
I ry 9o .,rE .
SeismoErao
193r- was a. Tecoro yea,r
for the nurúber of
earthgualces
.*derat.e, tho
berns
zzz-;"à-t;;"iliàrrron*
.to_tar
hlghest number s rnce rhe r,rlrne-shàw:.éir*óé;*pii-*ài"rrru
talj-eo
at the end cf tggb belne rge--in-igàgl .woraets :iumber for
6
yea.rs 1926-19Bl was 1Sg:
recoroed
at
;i,nother nctable feature shewn hy the 1931
re,:orq.s was a
renarkabl"e 1-'ve1 change durlng
lirà"*itrìrr
úr'r
rnontl:s.see
--€
nÒte to
"
JuiJ/ Burletlno
The ]"(ilne-shaw selsnDgrsph
3t .r,]elarde 1s ott
prÒnoììrrcud dl:llgr-gha1gé?-in-r;";i;pàitrcurarr,.
+ subJect t,)
rn crear slrru.v
days,whrch causss the rines of the iàé-,r0"
to cióse-::p ciurlng ti:e
afternoon,and. to open ouC
ourlng
the
nlghi. .,ilgo there
!Saf1 oy r*itr
1s usually a^1]1y--'cira$J caùsea
orrrlng
aric. a correspol-orna chàr.,qs fn Jpp""sil."'d.lr.rctionthe wj"*rèr months
or th: hot w-catilcrl Frt ,iorrSg tú:-ilintcr rnon.r,hs àt ,.ri_., b:glnnlng
of .r.93r.,thls
cff:ct was lntenslfLcd rJnari<ànfi"
'\pproclabl. tflt was spory fyon abrut tliJ mlo.d^r"r of Juns
thc gBnsc of, norih sloJ'f:qlil,urru r,ha nsxlrnru 3ffrct
1n thle dlrectron was loijo on'thc2iiì;-rr,e
tc b:1r.zb &rc"
tr'róm th3 boglrurlrrs* of .lu1yrtllt was ghowri
ln the opposJ.t:
( *::-ti:.tl*i"e]randincreaseu
;ftr$riitude
up ro u r.,,
'lroctlon,
l"
arc
1n one dayrnotoo. on-déth
."*óóitrnuar"usc
Ji
ti o rcvúrjln,,..
ryi,f
scrsw lcnEthened the free porloa'or
effect or-ttrt on t,rrs-iòóoras ras trre-;;F;";iàpii,"rro thus rhc
bolng, 1n
rntenslÍi.od"
Dr-ffleulty
experlenced for sono tlme ln obtaj.nlFs
plete r'corì's asuoas^
the ira"e nould. orooeìrgnt
off the tr)aper cori_a
îèw hours. the. qergpgsiàpù perroo was
iàa,:cea.g+ .ruri aano.,,lugust
let and" septenber .4th"i;-;eiro.er 1t reÀÀ
gensltj..,,o to tr].t.'r
The total tlIt frund. Í'or the perl'd
July 1s1, to septernb,sr 30th,
when the effect onr**"--srrrilrwas
nearl1, g nlnutes
rne ulke/selsmograptri{*L
of a'rcrw.sld-e'rrs1t:6:-;tói-il
of are.
cornpor:ont ) show.ecr a tllt
fJ16 perioc rd.ay to Octocer"
or a*
n1nut.r6
Scarica

SEISMOLOGICAL BULLETIN.