Ikari, Matt J; Niemeijer, André R; Spiers, K C; Kopf, Achim J; Saffer, Demian M (2014): Friction analysis of Costa Rica ocean sediments from ODP Hole 170-1039B, 170-1040C and 205-1253 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.834645
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Abstract:
Seismicity patterns offshore Costa Rica (Central America) at the Middle America Trench have led to speculation that large (moment magnitude, Mw ~7.0) earthquakes are associated with subducting topographic highs. In areas of high basement topography, a regionally extensive nannofossil chalk unit is exposed at the seafl oor on the incoming plate, whereas in regions of low basement topography, hemipelagic clay-rich sediment is exposed. Because the entire sediment section is subducted at this margin, lithologic variation in the uppermost subducting sediments may control plate boundary fault behavior. Our laboratory experiments reveal that the chalk is frictionally strong (µ = 0.71-0.88) and characterized by velocity weakening and stick-slip behavior, notably at elevated temperature. In contrast, the hemipelagic sediment is weak (µ = 0.22-0.35) and in many cases velocity strengthening. We suggest that the presence of frictionally unstable carbonates at bathymetric highs may play a key, previously unrecognized, role in governing earthquake nucleation.
Related to:
Ikari, Matt J; Niemeijer, André R; Spiers, K C; Kopf, Achim J; Saffer, Demian M (2013): Experimental evidence linking slip instability with seafloor lithology and topography at the Costa Rica convergent margin. Geology, 41(8), 891-894, https://doi.org/10.1130/G33956.1
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 9.650589 * Median Longitude: -86.189524 * South-bound Latitude: 9.640000 * West-bound Longitude: -86.200000 * North-bound Latitude: 9.661600 * East-bound Longitude: -86.178900
Date/Time Start: 1996-11-02T03:30:00 * Date/Time End: 2002-10-11T00:00:00
Comment:
Measurements of frictional strength and velocity-dependence of frictional strength for clay-rich and carbonate samples from offshore Costa Rica. Measurements of frictional stick-slip parameters also included. Measurements made at HPT Laboratory, Utrecht University, Utrecht, Netherlands
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets
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Datasets listed in this publication series
- Ikari, MJ; Niemeijer, AR; Spiers, KC et al. (2014): Stick and slip measurements from ODP Leg 170 and Leg 205. https://doi.org/10.1594/PANGAEA.834642
- Ikari, MJ; Niemeijer, AR; Spiers, KC et al. (2014): Details of experiments at different stress levels from ODP Hole 170-1039B, 170-1040C and 205-1253. https://doi.org/10.1594/PANGAEA.834643
- Ikari, MJ; Niemeijer, AR; Spiers, KC et al. (2014): Pressure and velocity measurements from ODP Hole 170-1039B, 170-1040C and 205-1253. https://doi.org/10.1594/PANGAEA.834644
- Ikari, MJ; Niemeijer, AR; Spiers, KC et al. (2014): Strength measurements from ODP Hole 170-1039B, 170-1040C and 205-1253. https://doi.org/10.1594/PANGAEA.834641