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Wilkens, Roy H; Christensen, Nikolas I; Collins, John A (1993): (Table 1) Compressional- and share-wave velocieties at elevated confining pressure of ODP Holes 136-842C and 136-843A [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.805006, Supplement to: Wilkens, RH et al. (1993): Seismic properties and reflectivity of North Pacific Ocean cherts. In: Wilkens, RH; Firth, J; Bender, J; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 136, 99-104, https://doi.org/10.2973/odp.proc.sr.136.210.1993

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Abstract:
Identification of a sediment/basement contact using seismic reflection recordings has proven to be extremely difficult in wide areas of the North Pacific Ocean owing to the presence of massive, highly reflective chert layers within the sediment column. Leg 136 of the Ocean Drilling Program recovered coherent pieces of chert of sufficient size for the first comprehensive laboratory measurements of the seismic properties of this material. Compressional-wave velocities of six samples at 40-MPa confining pressure averaged 5.33 km/s, whereas shear-wave velocities at the same pressure averaged 3.48 km/s. Velocities were independent of porosity, which ranged from 5% to 13%, suggesting that pores within the samples were mostly high aspect ratio vugs as opposed to low aspect ratio cracks. Back-scattered electron images made with a scanning electron microscope confirmed this observation.
Acoustic impedances were calculated for the chert samples and from shipboard measurements of the red clay sediment overlying the chert layers. An extremely large compressional-wave reflection coefficient (0.73) characterized the interface between the two lithologies. A synthetic seismogram was calculated using chert and typical pelagic carbonate properties to illustrate the influence of chert layers on a marine seismic-reflection section. Compressional-wave to shear-wave velocity ratios of the chert samples (Vp/Vs =1.53) are close to that of single-crystal quartz in spite of variable porosity. Shear-wave reflection coefficients are estimated to be approximately 0.94. A compressional-wave reflection coefficient for a basement/sediment (carbonate) interface is estimated to be approximately 0.50, significantly less than that of sediment/chert.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 19.339000 * Median Longitude: -159.092000 * South-bound Latitude: 19.336000 * West-bound Longitude: -159.095000 * North-bound Latitude: 19.342000 * East-bound Longitude: -159.089000
Date/Time Start: 1991-03-05T20:00:00 * Date/Time End: 1991-03-08T22:00:00
Minimum Elevation: -4441.0 m * Maximum Elevation: -4423.0 m
Event(s):
136-842C  * Latitude: 19.336000 * Longitude: -159.089000 * Date/Time Start: 1991-03-05T20:00:00 * Date/Time End: 1991-03-07T00:30:00 * Elevation: -4441.0 m * Penetration: 237.7 m * Location: North Pacific Ocean * Campaign: Leg136 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 0 cores; 0 m cored; 0 m drilled
136-843A  * Latitude: 19.342000 * Longitude: -159.095000 * Date/Time Start: 1991-03-07T07:09:00 * Date/Time End: 1991-03-08T22:00:00 * Elevation: -4423.0 m * Penetration: 237.7 m * Recovery: 1.39 m * Location: North Pacific Ocean * Campaign: Leg136 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 1 core; 9.7 m cored; 0 m drilled; 14.3 % recovery
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 Event labelEvent
2 Sample code/labelSample labelWilkens, Roy HDSDP/ODP/IODP sample designation
3 Velocity, compressional waveVpm/sWilkens, Roy H10 MPa
4 Velocity, compressional waveVpm/sWilkens, Roy H20 MPa
5 Velocity, compressional waveVpm/sWilkens, Roy H30 MPa
6 Velocity, compressional waveVpm/sWilkens, Roy H40 MPa
7 Velocity, compressional waveVpm/sWilkens, Roy H50 MPa
8 Velocity, compressional waveVpm/sWilkens, Roy H60 MPa
9 Velocity, compressional waveVpm/sWilkens, Roy H70 MPa
10 Velocity, compressional waveVpm/sWilkens, Roy H80 MPa
11 Velocity, compressional waveVpm/sWilkens, Roy H90 MPa
12 Velocity, compressional waveVpm/sWilkens, Roy H100 MPa
13 Velocity, shear waveVsm/sWilkens, Roy H10 MPa
14 Velocity, shear waveVsm/sWilkens, Roy H20 MPa
15 Velocity, shear waveVsm/sWilkens, Roy H30 MPa
16 Velocity, shear waveVsm/sWilkens, Roy H40 MPa
17 Velocity, shear waveVsm/sWilkens, Roy H50 MPa
18 Velocity, shear waveVsm/sWilkens, Roy H60 MPa
19 Velocity, shear waveVsm/sWilkens, Roy H70 MPa
20 Velocity, shear waveVsm/sWilkens, Roy H80 MPa
21 Velocity, shear waveVsm/sWilkens, Roy H90 MPa
22 Velocity, shear waveVsm/sWilkens, Roy H100 MPa
23 Density, wet bulkWBDg/cm3Wilkens, Roy H
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
132 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 
Event		2 
Sample label		3 
Vp [m/s]
(10 MPa)		4 
Vp [m/s]
(20 MPa)		5 
Vp [m/s]
(30 MPa)		6 
Vp [m/s]
(40 MPa)		7 
Vp [m/s]
(50 MPa)		8 
Vp [m/s]
(60 MPa)		9 
Vp [m/s]
(70 MPa)		10 
Vp [m/s]
(80 MPa)		11 
Vp [m/s]
(90 MPa)		12 
Vp [m/s]
(100 MPa)		13 
Vs [m/s]
(10 MPa)		14 
Vs [m/s]
(20 MPa)		15 
Vs [m/s]
(30 MPa)		16 
Vs [m/s]
(40 MPa)		17 
Vs [m/s]
(50 MPa)		18 
Vs [m/s]
(60 MPa)		19 
Vs [m/s]
(70 MPa)		20 
Vs [m/s]
(80 MPa)		21 
Vs [m/s]
(90 MPa)		22 
Vs [m/s]
(100 MPa)		23 
WBD [g/cm3]
136-842C 136-842C-1W-1,34-37521652655289530553165324533053355340534434523463346934733476347834803482348334852.477
136-842C136-842C-1W-1,43-45539454325451546454735480548654925497550235273536354135443545354735483549355135522.560
136-843A 136-843A-2W-1,10-13517752205241525252605266527152765280528433933407341834263433343934433447345134542.469
136-843A136-843A-2W-1,22-26528953125322532953355341534753545360536534793492349935033507350935123514351635172.536
136-843A136-843A-2W-1,35-37522552475261527352825291529853055312531833773392340034053409341134143416341734192.557
136-843A136-843A-2W-1,42-45528953395365538353965405541354205426543134783504351935303538354435503555355935632.438