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USGS-OFR-93-317 USGS-OFR-93-317
U.S. DEPARTMENT OF THE INTERIOR
U.S. GEOLOGICAL SURVEY
ONSHORE-OFFSHORE WIDE-ANGLE SEISMIC RECORDINGS FROM CENTRAL
OREGON: THE FIVE-DAY RECORDER DATA
By
Anne M. Trehu^ and Yosio Nakamura^
Open-File Report 93-317
^College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331 ^Institute for Geophysics, University of Texas, Austin, TX 78759
This report was prepared under a grant from the U.S. Geological Survey and has not been
reviewed for conformity with U.S. Geological Survey editorial standards or with the North
American Stratigraphic Code. Opinions and conclusions expressed herein to not necessarily
represent those of the USGS. Any use of trade, product or firm names is for descriptive purposes
only and does not imply endorsement by the U.S. Government.
Menlo Park, California
1993
CONTENTS
Abstract 2Introduction and Objectives 2Data Acquisition and Processing 4Description of the Data 8Acknowledgements 13References Cited 13
FIGURES
Figure 1. Generalized tectonic setting of the Cascadia subduction zone 3Figure 2a. Location map of Oregon showing seismic lines and recorders 5Figure 2b Line drawing interpretation of multichannel seismic reflection line 5Figure 3a. Receiver gather from OBS1, vertical component 10Figure 3b. Receiver gather from OBS2, vertical component 10Figure 3c. Receiver gather from OBS2, radial component 10Figure 3d. Receiver gather from OBS2, transverse component 10Figure 3e. Receiver gather from OBS4, vertical component 11Figure 3f. Receiver gather from OBS3, vertical component 11Figure 3g. Receiver gather from OBS8, vertical component 12Figure 3h. Receiver gather from OBS5, vertical component 12
TABLES
Table 1. OBS locations and depths 7
APPENDICES
A. Shotpoint times and locations 15 B. UTIG SEGY format 30
ABSTRACT
The University of Texas and Oregon State University deployed eight ocean bottom
seismometers (OBS) during marine seismic reflection profiling of the central Oregon margin
conducted in September 1989 (figure 1). The OBS's were deployed along the reflection profile to
record the shots from a tuned 128 liter (7800 cu. in.) airgun array towed by a commercial seismic
ship. This report provides the locations of the OBS's, discusses the preliminary processing
procedures, and illustrates the recorded wide-angle seismic data.
INTRODUCTION AND OBJECTIVES
In September, 1989, investigators from Oregon State University (OSU), University of
Texas Institute for Geophysics (UTIG), and the U.S. Geological Survey (USGS) collaborated to
collect a seismic reflection profile and wide-angle seismic recordings along the reflection line in
central, coastal Oregon (Trehu et al., 1990; Lin and Trehu, 1991). This study was followed in
1991 by an onshore seismic refraction profile that overlapped and extended the 1989 profile east to
the Cascade foothills. Results from an inversion of the travel times recorded during the 1989 and
1991 experiments were presented by Trehu et al. (1992a,b).
In the following we report on wide-angle data obtained by a deployment of University of
Texas at Austin ocean-bottom seismometers during the acquisition of the seismic reflection profile.
Complementary data recorded onshore are presented in companion Open-file Reports by Brocher et
al. (1993) and Trehu et al. (1993).
49 46 Figu
re 1
Lo
catio
n m
ap o
f Pac
ific
Nor
thw
est s
how
ing
the
stud
y ar
ea a
nd p
ositi
on o
f 198
9 on
shor
e-
offs
hore
sei
smic
exp
erim
ent i
n ce
ntra
l Ore
gon
as a
hea
vy g
ray
line.
DATA ACQUISITION AND PROCESSING
The tuned airgun array used for marine reflection profiling, which had a total volume of
128 liters (7800 cu. in.), also served as a seismic source for ocean bottom seismometers positioned
along the profile on the continental shelf, slope and adjacent abyssal plain (fig. 2a). The locations
and origin times of all shot points are listed in Appendix A. A simplified line drawing of the
unmigrated seismic reflection profile is shown in figure 2b (Lin and Trehu, 1991; Trehu, A., and
G. Lin, A deep crustal seismic profile across the central Oregon continental margin; manuscript in
preparation).
The OBS's were prepared for deployment in a laboratory at the Hatfield Marine Science
Center in Newport, Oregon. When notice was received that the shooting ship was approaching the
beginning of the line, eight OBS's were loaded onto a 72-foot-long fishing boat chartered for the
occasion (the F/V Olympic) and deployed along the profile prior to the start of shooting. The large
gap in spacing between sites 2 and 3 resulted from the need to avoid water depths in which
fishermen were actively dragging for shrimp. The gap in spacing between 5 and 8 results from
failure of instrument 6, which was deployed at the base of the slope, just seaward of the
deformation front.
Six of the OBS's were of the type described in detail by Nakamura et al. (1987). The data
storage capacity of these instruments is 5 MBytes, which is insufficient to record continuously for
the time it takes to shoot a 120 km long seismic reflection profile. This presents a significant
logistic challenge since it requires that deployment and shooting ships be very well syncronized
and that the shooting ship shoot at equal time intervals rather than equal distance intervals in order
to maximize the efficiency of data storage. Moreover, only every other shot (ie. one minute, or
approximately 132 meter, intervals) could be recorded. One of these instruments, located at the
base of the continental slope (OBS 6), failed to record data; the other five each recorded the entire
profile. One instrument (OBS 4) had a faulty memory, resulting in intermittent distortion of data.
4SN
126W
12
5W
124W
FIG
UR
E 2
. (A
) M
ap o
f cen
tral
Ore
gon
show
ing
the
loca
tions
of t
he m
arin
e re
flec
tion
line
(eve
ry
tent
h sh
ot s
how
n as
a s
mal
l dot
), te
mpo
rary
sei
smic
reco
rder
s (l
arge
cir
cles
), an
d of
fsho
re
bath
ymet
ry.
DISTA
NCE A
LONG
PROF
ILE (k
m)
FIG
UR
E 2
. (B
) Si
mpl
ifie
d lin
e dr
awin
g of
the
imm
igra
ted
27 t
o 28
-fol
d se
ism
ic r
efle
ctio
n lin
e
show
ing
the
posi
tion
of N
eoge
ne b
asin
s. T
he to
p of
the
ocea
nic
crus
t (O
C),
the
top
of th
e Si
letz
V
olca
nics
(S V
), an
d a
refl
ectio
n fr
om w
ithin
the
low
er c
rust
, int
erpr
eted
to r
epre
sent
the
base
of
the
Sile
tz V
olca
nics
(LC
) ar
e al
so s
how
n.
L.C
.
Two of the OBS's contained the new large capacity recording system described by
Nakamura and Garmany (1991). These instruments recorded three orthogonal geophone
components for each shot onto 155 MByte digital cartridge tapes. This experiment represented
only the second field deployment for these instruments and was only moderately successful
because of a programming error in the internal OBS clock. One instrument recorded a portion of
the profile (OBS 2) and released early; it was recovered with the assistence of the local shrimping
fleet. The other was not deployed.
Timing for the OBS's was provided by an internal clock that was calibrated with a GOES
clock just before deployment and immediately after retrieval. Corrections to the timing to corrrect
for drift were applied during the preliminary processing stage. Because the OBS clock is designed
to drift forward, with periodic setbacks to compensate for the positive drift, this procedure is quite
complicated and includes several components: a sawtooth function due to the periodic setbacks, a
linear long-term drift obtained from comparison with the pre- and post-deployment calibrations,
and a constant delay between when the OBS system fetches time from the clock and when it
acquires the first sample.
Shot instant times were obtained using a PC-based recorder located on the commercial
seismic vessel. A Kinemetrics True Time satellite clock receiver (model 468), set for the local
time delay to the GOES satellite, and stabilized using a high-precision Cesium oscillator, provided
the absolute time base recorded on the commercial vessel. The GOES clock receiver produces time
accurate to a millisecond.
Navigation on the deployment ship was by Loran C. This was adequate to place the
instruments along the profile and to retreive them afterwards. For further analysis of the data,
instruments positions were calculated using observed first arrivals from shots in the vicinity of the
OBS's. For sites 1 and 2, the first arrivals represent waves refracted in the uppermost sediments,
and the sediment velocity was treated as an additional variable in the inversion. For sites 3-7, the
first arrivals were water waves, and the water velocity obtained from Matthew's tables was used.
For site 8, a water velocity of 1500 km/s was assumed. The shot data were also used to orient the
horizontal components at site 2, and the data were rotated to extract the radial and transverse
components. These procedures are described in detail by Nakamura et al. (1987). Instruments
were relocated independently at UT and at OSU with similar results. The instrument locations are
summarized in Table 1. Although two solutions, one on each side of the shot line, are obtained
from the inversion (except for site 2, where water wave polarization observations remove this
ambiguity), only the preferred solution, chosen by comparison with the position of the ship on
deployment as determined from Loran C, is listed. Also listed is the computed delay time of the
shots, which represents an estimate of the lag time between the time of the shot trigger recorded on
the shooting ship and the actual shot time. A mean shot instant delay of 48 ms is indicated.
Instrument depths were estimated from the echo sounder on the F/V Olympic.
Table 1. Location and depth of ocean bottom seismometers. The shots used for each site are also
indicated.
Site
12*
3
4
5
8
Shots used
5068-5034
4929-4891
4584-4544
4302-4262
3948-3868
3260-3170
Latitude (°N)44°51'04.9"
44°50'55.3"
44°50'32.8"
44°50'18.0"
44°50'06.1"
44°48'51.9"
Longitude (°W)124°10'35.0"
124° 17*51.0"124°35'23.2"
124°49'24.7"
125°07'39.8"
125°42'23.5"
v, m/s
1756
1734
1480
1480
1481
1500
Dt, ms
57
44
39
57
41
50
St, ms
4
3
3
4
5
4
Dep, m
75
130
335
385
1840
2890
v = sub-bottom wave speed for sites 1 & 2 (output), water-wave speed for other sites (input)Dt = computed time delaySt = standard deviation in arrival time readings*The orientation of the instrument defined by the direction of +Hi axis measured clockwise from
north = 118.4 ±1.6° on map (UTM), or 117.5±1.6° from true north Dep = Depth in meters. Instrument depths were initially determined from the echo sounder on the
R/V Olympic. These depths were then compared to depths obtained from the water bottomreflection of the closest shot to each instrument.
Instrument depths were initially determined from the echo sounder on the F/V Olympic.
Shot-receiver offsets were calculated using the navigation data from the shooting ship (obtained
using Starfix), corrected for the offset between the ship's antenna and the center of the airgun
array, and the OBS locations obtained from the inversion. The timing corrections, corrected
navigation information, and calculated shot-receiver offsets were then merged with the trace
headers and reformatted into SEGY format tapes (Barry et al., 1975), as interpreted by UTIG
(appendix B).
DESCRIPTION OF THE DATA
Figure 3 illustrates the data recorded at the six OBS's. For display, data were filtered with
a minimum phase bandpass filter with a passband of 5 to 25 Hz , reduced using a velocity of 6.5
km/s, and corrected for geometrical spreading by multiplying trace amplitudes by a factor of
(offset/10 km)0-75 For offsets less than 10km, no geometrical spreading was applies. For
OBS2, which recorded every shot, two adjacent traces were added together.
The signal to noise ratio of the recorded data is quite variable along the profile. OBS 1
(figure 3a), nearest to the coast, is very noisy. In addition to noise generated at the coast line or
sea surface at this shallow water site, this station may be affected by cultural noise due to an active
quarry onshore, which began operation at 6:30 AM (i.e. offsets greater than 55 km for OBS1).
Data on OBS2 (figure 3b-d) are limited to near offsets because of the clock error mentioned above,
and there are several significant data gaps. Data on OBS4 (figure 3e) are noisy because of the
memory problem mentioned earlier. In addition, data from that station are strongly affected by
water-borne energy from the previous shot. Because of the limited storage capacity of the OBS's,
requiring recording of shots at about 132 m intervals, our ability to remove this noise through f-k
filtering is very limited. The best data were recorded on OBSs 3 (figure 3f) and 5 (figure 3h),
where strong arrivals are observed to the maximum offsets recorded. Although interference from
water-borne energy is observed, the primary signal is still clearly detected in this region. For
reasons not understood, this water-borne energy is strongest at OBSS (figure 3g), the deep water
site on the abyssal plain, and severely limits the maximum offset to which primary seismic arrivals
are observed at this site.
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ACKNOWLEDGEMENTS
Thanks to Terry Thompson, the captain of the F/V Olympic and his crew for their help in
deploying the OBS's. John Shay (OSU; now at SIERRA Geophysics) and Gary Lux (UTIG) also
assisted with deployment Guy Cochrane was the observer on the shooting ship. Tim Holt helped
with initial data processing and display. The Hatfield Marine Science Center provided laboratory
space to prepare the OBSs for deployment. Tom Brocher and H.M. lyer reviewed the manuscript.
This work was supported by the National Science Foundation through grants OCE-8900962 and
EAR-8905189 and by the USGS NEHRP grant 1408-0001G2072.
REFERENCES CITED
Barry, K.M., D.A. Cravers, and C.W. Kneale, 1975, Recommended standards for digital tape
formats: Geophysics, v. 40, p. 344-352. Brocher, T.M., M.J. Moses, and A.M. Trehu, 1993, Onshore-Offshore wide-angle seismic
recordings from central Oregon: The five-day recorder data: U.S. Geological Survey Open-
file Report 93-318, 24 pp. Lin, G., and A. Trehu, 1991, Further constraints on the structure of the Cascadia subduction zone
offshore central Oregon: EOS Transactions of the American Geophysical Union, v. 72, p.
323. Nakamura, Y., P. Donoho, P. Roper, and P. McPherson, 1987, Large-offset seismic surveying
using ocean bottom seismographs and air guns: instrumentation and field technique:
Geophysics, v. 72, pp. 1601-1611. Nakamura, Y., and J. Garmany, 1991, Development of upgraded ocean-bottom seismograph:
University of Texas Institute for Geophysics Technical Report No. Ill, 45 pp. Trehu, A., T. Holt, J. Shi, Y. Nakamura, T. M. Brocher, and M. Moses, 1990, Preliminary
results from the 1989 Oregon onshore-offshore seismic imaging experiment: EOS
Transactions of the American Geophysical Union, v. 77, p. 1588. Trehu, A.M., and others, 1992a, Crustal structure of the Cascadia subduction zone beneath
western Oregon: Geological Society of America Bulletin supplement, abstracts of the
Cordilleran section meeting, Eugene, OR, v. 24, no. 5, p. 87.
13
Trehu, A. M., J. Nabelek, S. Azevedo, T. Brocher, W. Mooney, J. Luetgert, I. Asudah, R. Clowes, Y. Nakamura, S. Smithson, K. Miller, 1992b, A crustal cross-section across the Cascadia subduction zone in central Oregon: EOS Transactions of the American Geophysical
Union, v. 73, p. 391.Trehu, A. M., S. Azevedo, J. Nabelek, J. Luetgert, W. Mooney, I. Asudeh, and B. Isbell, 1993,
Seismic refraction data across the Coast Range and Willamette Valley in central Oregon: The 1991 Pacific Northwest Experiment: U.S. Geological Survey Open-file Report 93-319, 31
pp.
14
APPENDIX A
Oregon Margin Line 89OR100 Digicon, October, 1989 Airgun : Starfix WGS-72 : UTM zone 10 : meters
shotno.50975096509550945093509250915090508950885087508650855084508350825081508050795078507750765075507450735072507150705069506850675066506550645063506250615060505950585057505650555054505350525051505050495048504750465045504450435042
origintime07:00:3107:01:0107:01:3107:02:0107:02:3107:03:0107:03:3107:04:0007:04:3007:05:0007:05:3007:06:0007:06:3007:07:0007:07:3007:08:0007:08:3007:08:5907:09:2907:09:5907:10:2907:10:5907:11:2907:11:5907:12:2907:12:5907:13:2907:13:5907:14:2907:14:5907:15:2907:15:5907:16:2907:16:5907:17:2907:17:5907:18:2907:18:5907:19:2907:19:5907:20:2907:20:5907:21:2907:21:5907:22:2907:22:5907:23:2907:23:5907:24:2907:24:5907:25:2907:25:5907:26:2907:26:5907:27:2907:27:59
latitude longitude(«N) (°W)44.85414 -124.1398044.85411 -124.1405844.85408 -124.1413944.85408 -124.1421944.85405 -124.1430044.85405 -124.1437844.85405 -124.1446144.85405 -124.1454444.85403 -124.1462244.85397 -124.1470344.85394 -124.1478644.85394 -124.1486444.85394 -124.1494144.85394 -124.1501944.85397 -124.1510044.85397 -124.1518144.85397 -124.1525644.85397 -124.1533744.85397 -124.1541744.85397 -124.1550044.85397 -124.1558144.85397 -124.1566244.85400 -124.1573944.85400 -124.1582344.85397 -124.1590044.85394 -124.1598444.85389 -124.1606144.85383 -124.1614544.85381 -124.1622544.85381 -124.1631144.85378 -124.1639244.85378 -124.1647544.85375 -124.1655344.85372 -124.1663644.85372 -124.1671744.85369 -124.1679744.85369 -124.1687844.85366 -124.1695844.85355 -124.1703644.85347 -124.1711344.85339 -124.1719144.85333 -124.1727244.85333 -124.1735544.85333 -124.1743344.85336 -124.1751644.85336 -124.1759744.85336 -124.1767744.85336 -124.1775544.85339 -124.1783844.85339 -124.1791644.85336 -124.1799444.85336 -124.1806944.85336 -124.1815344.85339 -124.1823644.85342 -124.1832244.85344 -124.18406
50415040503950385037503650355034503350325031503050295028502750265025502450235022502150205019501850175016501550145013501250115010500950085007500650055004500350025001500049994998499749964995499449934992499149904989498849874986498549844983498249814980497949784977
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22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:22:
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29
APPENDIX B UTIG OBS SEG-Y Format Tape Trace Header Information
Bytes1
1-4, 5-8 9-12
13-1617-2029-3031-3233-3435-3637-4041-4449-5261-6465-6869-7071-7273-7677-8081-8485-8889-90109-110115-116117-118119-120141-142143-144157-158159-160161-162163-164165-166 .167-168 181-184
Value2
V
V
V
V
1111V
ccV
c1
-10
V
V
cc2
V
cc3c
24cV
V
V
V
V
V
Data Description
Trace sequence number Field record number3Component4Shot numberTrace identification code = seismic dataVertical summing = noneHorizontal stacking = noneData use = productionDistance from source to OBSOBS depth (negative elevation)Source depthWater depth at sourceWater depth at OBSDepth scale factor = 1Coordinate scale factor = 0.1Source longitudeSource latitudeOBS longitudeOBS latitudeCoordinate units = seconds of arcDelay recording time^Number of samplesSample intervalInstrument gain type = floating pointAlias filter frequencyAlias filter slopeYear data recordedDay of yearHour of dayMinute of hourSecond of minuteMillisecond of the first sample of the trace6 Shot azimuth7
Unit
m-m
mmm
o.ro.ro.ro.r
ms
\JLS
HzdB/oct
0.01°
1Those not listed are all zeroes^v = variable for each trace; c = generally constant for each OBS/line3Usually OBS record number plus a constant offset to give a unique record number to each record41 = horizontal 1 or radial; 2 = horizontal 2 or transverse, 3 = vertical5Note that this quantity varies for each trace, and usually is negative at close ranges6Note that this a non-SEG-standard entry7Azimuthal angle of shot location as seen from OBS, measured clockwise from north
30
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