USGS Professonal Paper 1096 - IRIS

ARKANSAS
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GENERAL INFORHATION
Operated by:
Address:
St. Louis University
Department of Earth & Atmospheric Sciences
St. Louis University
P 0 Boy 8099, laclede Station
St. Louis, no 63156
Telephone: 314-535-3300
'aarcss t-a alit-aiR rceerBs:
As above.
SITE iNFORMATION
Code
Stab on
name
Latitude Longi tude Elev
(deg N. ) (deg W. ) (meters)
Date
opened
Date
closed
Foundation; geologic age
(HCI) Hatchie Coon Island----- 35 6950 90.3450 67
11/76 Open--
Alluvium (~anrly
clay).
LRA Ll-ttle Rocf------------- 34. 1/83 92 3511 ISO
PGA Paragould--------------- 36 .0600 90 6200 152
POW Powhatan---------------- 36.1520 91.1850 IS'
2/02731 il 21 / 6)
12/28/74 Open--
6/19/74 --do--
Sandstone, 6Idovician.
Claiborne Group (clay-gravel);
Eocene
Everton Formation (limestone);
Ordovician.
WLA wittsbulg Lake 35. 1860 30. n0e 116
10/73 Hlj28/7§ JaekseR G£9blfl (elH'!£t-) elay);
Eocene.
INSTRUMENTATION
Code
Seismometer
Ga1vo Type Magnification
Type Component T (sec) T (sec) recording .t T
0
0 ,
Remal:ks
(HCI) Mark L-4C------------ Z 1.0 Develucorder, 182 K Magnification 10 Hz;
magnetic tape.
telemetered " to Saint
Louis .
LRA 1931-1954------------ NS,EW 2.5 Photo paper . 5 K
Wood-Anderson.
1954-1960 Reef------- NS,EW .0 .0 --do------- 15 K
__ do _______
196 0 - 1
96 7 ------------ 7 0
50 K
Wilson Lamison.
1960-1967------------ NS,EW 2. 5 --do------- 2.5 K
Wood-Anderson.
PG" MaTk h 'It: ---------- Z l.Q De ue1 0corder 238 K Magnjfjcation at 10 Hz·
magnetic tape.
POW --do----------------- Z .0 --do--------- 1570 K Do.
WLA Geospace HS-IO-l----- Z 1. 0 1.0 Photo paper 50 K
telemetered to Saint
Louis.
48