Show simple item record

dc.contributor.authorWimpenny, Samuel
dc.contributor.authorCopley, Alexander
dc.contributor.authorBenavente, Carlos
dc.contributor.authorAguirre, Enoch
dc.date.accessioned2018-11-14T00:31:22Z
dc.date.available2018-11-14T00:31:22Z
dc.date.issued2018-09
dc.identifier.issn0148-0227
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/285048
dc.description.abstractThe M w 6.1 2016 Parina earthquake led to extension of the south Peruvian Andes along a normal fault with evidence of Holocene slip. We use InSAR, seismology and field mapping to determine a source model for this event and show that extension at Parina is oriented NE-SW, which is parallel to the shortening direction in the adjacent sub-Andean lowlands. In addition, we use earthquake source models and GPS data to demonstrate that shortening within the sub-Andes is parallel to topographic gradients. Both observations imply that forces resulting from spatial variations in gravitational potential energy are important in controlling the geometry of the deformation in the Andes. We calculate 9 the horizontal forces per unit length acting between the Andes and South America due to these potential energy contrasts to be 4 − 8 × 10 12 N per metre along-strike of the mountain range. Normal faulting at Parina implies that the Andes in south Peru have reached the maximum elevation that can be supported by the forces transmitted across the adjacent foreland, which requires that the foreland faults have an effective coefficient of friction <0.2. Additionally, the onset of extension in parts of the central Andes following orogen-wide compression in the late Miocene suggests there has been a change in the force balance within the mountains. We propose that shortening on weak detachment faults within the Andean foreland since ∼5-9 Ma reduced the shear tractions acting along the base of the upper crust in the eastern Andes, leading to extension in the highest parts of the range.
dc.publisherWiley-Blackwell
dc.titleExtension and Dynamics of the Andes inferred from the 2016 Parina (Huarichancara) Earthquake
dc.typeArticle
prism.endingPage8228
prism.publicationNameJournal of Geophysical Research
prism.startingPage8198
prism.volume123
dc.identifier.doi10.17863/CAM.32418
dcterms.dateAccepted2018-08-23
rioxxterms.versionofrecord10.1029/2018JB015588
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2018-08-23
dc.contributor.orcidWimpenny, Samuel [0000-0002-2937-7501]
dc.contributor.orcidCopley, Alexander [0000-0003-0362-0494]
dc.identifier.eissn2169-9356
rioxxterms.typeJournal Article/Review
pubs.funder-project-idNatural Environment Research Council (NE/M017559/1)
pubs.funder-project-idNERC (via University of Leeds) (RGEVEA100399)
pubs.funder-project-idNERC (via British Geological Survey (BGS)) (GA/16S/001)
pubs.funder-project-idNatural Environment Research Council (NE/K011014/1)
cam.issuedOnline2018-08-29
rioxxterms.freetoread.startdate2019-02-28


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record