SEISMOLOGICAL BULLETIN.

ADELAIDE OBSERVATORY,
SOUTH AUSTRALTA.
SEISMOLOGICAL BULLETIN.
Prepared under the direetion of
G. F. DODWELIJ, 8.A.,
F.R.A.S.,
ClovnnNunwr AsrRoNoMEB.
ì
O.g4". bb'. .B8O'.
S. r.
9à.
l4'.
19.81".
A.
Height above Mean Sea Level-134 feet.
SITUATION.-5 miles West of Mou:rt I-rofty Ranges, 5 miles East of
Sea Coast.
FOIINDATION.-Mar1y Limestone and Clay of Adelaide Plains, to depth of 40 feet. Miocene Sandstone
probably below. Depth of bedrocks not known, probably 1,000 to 2,000 feet.
,A
INSTRUMENTS.-MiIne's Ilorizontal Pendulum, No. 50, 1904 Patfern. E.-W. Component BecordedMitne-Shaw Seismogaph, No. 35. N.-S. Component.
NorlrroN.
II. : striking. III. : very striking.
l. : psrceptible.
d (domesticus) : local.
: near (less than 1000km.).
v (vicinus)
r
(remotus)
u
(ultimus)
:
distant (1000km.-5000kn.).
very distant (over 5@0km.).
Pslsps.
I
P
(primae)
S
(secuntlae)
Lr (longae)
M (maximae)
C
(coda)
F
(finis)
PRl,
PR2
sR1, sR2
i
(impetus)
e (emersio)
E,N
A
E.Q.
: lst preliminary tremors (commencenent).
(commencement).
- 2nd preliminary tremors
- t*{ principal phase, Rayleigh waves.
: maximnm amplitude of I-r waves.
: e prominent wave among the "after tremots."
: last peroeptible movement (non-microseismic).
: 1st and 2nd reflected waves of P.
: 1st and 2nd reflected waves of S.
: abrupt eommencement, clearly defined.
: gradual commencement, not clearly cleffned.
: E-W or N-S component of earth oscillation.
: approximate distance from epicentre in lm.
-
earthquake.
$:,'
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Î
ADEI-AIDE OBSERVATORY,
SOUTFI AUSTR.ALIA.
SEISMOLOGICAL BULLETIN.
Prepared under the direction of
G. F. DODWEIJIJ, B.4., F.R.A.S.,
GovunNurxr AsrnoNounn.
ó.34". 56'. 390". S.
r.
gh. r4n,. 19.91".
E.
Ileight
above Mean Sea
SITUATION.-5 miles West of Mount Lofty Ranges, 5 miles East of
Level-134 feet.
Sea Coast.
FOUNDATION.-MarIy l-:imestone and Clay of Adelaide Plains, to depth of 40 feet. Miocene Sandstone
probably below. Depth of bedrocks not known, probably 1,000 to 2,000 îeet.
INSTRtfMENTS.-Milne's llorizontal Pendulum, No. 50, 1904 Pattern. E.-W. Component
Milne-Shaw Seismograph, No.
35. N.-S.
Recorded-
Component.
NorarroN.
l. :
psrceptible.
III. : very striking.
striking.
d (domesticus) : local.
: nea,r (less than 1000km.).
v (vicinus)
: distant (1000km.-5000km.).
r (remotus)
II. :
u (ultimus)
:
very distant (over 5000km.).
Ps.e,sps.
I
^
P
(primae)
:
S
(secundae)
L
(longae)
- 2nd preliminary tremors
- {} principal phase, Rayleigh ÌvaYes.
: maximum amplitude of L, wavee.
M (maximae)
1st preliminary tremors (commencement).
(commencement).
C
(coda)
a prominent wave among the
F
(finis)
last perceptible movement (non-mieroseismic).
PR1, PR"
SR,, SR,
i
(impetus)
e (emersio)
E,N
A
E.Q.
"after
trem.ors."
: 1st and 2nd refleetecl rvaves of P.
: lst ancl 2nd reflected waves of S.
:- abrupt commencement, clearly deffned.
: gradual commencemen!, not clearly defined.
: E-W or N-S component of earth oscillation.
: approximate distance from epicentre in lm.
: earthquake.
e'
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( Gr.-:e11lr 1
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Record.ed
of,
iìemarks
perlod
S* Waves
40 5?
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1"8
3.5
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Probably more
than L shock.
0.6
0,9
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to r?fl
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80 40
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tio5
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r{
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$
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16.0
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42 2B
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46 00
49 i0
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16"0
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0.7
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44 40
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64 40
55 45
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1.9
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0.8
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24 00
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F
18 46
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908
9.0
18 "g
900
13 "g
9.0
6.2
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_19..0 secs. DarDlng Batl. g0 : 1
perto-d. gf
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"
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)
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perJ.od of,
lvaves
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