Geological observations on the volcanic islands and parts of South America visited during the voyage of H.M.S. 'Beagle'

Darwin, Charles; Forbes, Edward; Lonsdale, William; Sowerby, G. B.

doi:10.5962/bhl.title.61452

Cited by 51 publications

(37 citation statements)

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“…The yellow star marks the epicentre of the Maule earthquake as relocated by Vigny et al (2011), and the green star marks the epicentre of the M w 7.0 event of 2012 March 25 (Ruiz et al 2013(Ruiz et al ). et al 2012 in the segment last activated during the great event of 1835 documented by Charles Darwin (Darwin et al 1895, Fig. 1).…”

Section: Au L E E a Rt H Q Ua K Ementioning

confidence: 90%

High-frequency seismic radiation from Maule earthquake (Mw 8.8, 2010 February 27) inferred from high-resolution backprojection analysis

Palo

Tilmann

Krüger

et al. 2014

Geophysical Journal International

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S U M M A R YThe Maule earthquake (2010 February 27, M w 8.8, Chile) broke the subduction megathrust along a previously locked segment. Based on an international aftershock deployment, catalogues of precisely located aftershocks have become available. Using 23 well-located aftershocks, we calibrate the classic teleseismic backprojection procedure to map the highfrequency seismic radiation emitted during the earthquake. The calibration corrects traveltimes in a standard earth model both with a static term specific to each station, and a 'dynamic' term specific to each combination of grid point and station. The second term has been interpolated over the whole slipping area by kriging, and is about an order of magnitude smaller than the static term. This procedure ensures that the teleseismic images of rupture development are properly located with respect to aftershocks recorded with local networks and does not depend on accurate hypocentre location of the main shock.We track a bilateral rupture propagation lasting ∼160 s, with its dominant branch rupturing northeastwards at about 3 km s −1 . The area of maximum energy emission is offset from the maximum coseismic slip but matches the zone where most plate interface aftershocks occur. Along dip, energy is preferentially released from two disconnected interface belts, and a distinct jump from the shallower belt to the deeper one is visible after about 20 s from the onset. However, both belts keep on being active until the end of the rupture. These belts approximately match the position of the interface aftershocks, which are split into two clusters of events at different depths, thus suggesting the existence of a repeated transition from stick-slip to creeping frictional regime.

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Section: Au L E E a Rt H Q Ua K Ementioning

confidence: 90%

High-frequency seismic radiation from Maule earthquake (Mw 8.8, 2010 February 27) inferred from high-resolution backprojection analysis

Palo

Tilmann

Krüger

et al. 2014

Geophysical Journal International

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“…Darwin (1846Darwin ( , 1900 provided the first geological study of the region aboard the H.M.S. Beagle in 1835.…”

Section: Previous Workmentioning

confidence: 99%

Paleontologic Evidence for Sedimentary Displacement in Neogene Forearc Basins of Central Chile

Finger

Nielsen

DeVries

et al. 2007

PALAIOS

110

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A consensus on the biostratigraphic age and depositional environment of the Navidad, Ranquil, and Lacui formations exposed along the tectonic margin of central Chile has been elusive due to conflicting evidence. This study resolves this dilemma and gains further insight regarding the history of the Chilean coast. Problematic interpretations stem primarily from the remarkable similarity between the molluscan fauna of these units with those well documented for the late Oligocene to early Miocene of Peru. Planktic foraminifers, however, indicate that the Chilean sections accumulated in the late Miocene to early Pliocene interval following a regional hiatus that extends into the Eocene. The prevalence of mixed-depth bathyal assemblages of benthic foraminifers and ostracodes, the majority of which include lower-bathyal (Ͼ2000 m) indicators, reveals that downslope displacement was a primary mode of deposition in the basins. Although the molluscan assemblages are dominated by shallow marine taxa, most include species that range into or are restricted to deeper waters. Sedimentary features connote rapid subsidence and deep-water deposition of gravity flows. Although older Tertiary and Cretaceous planktic foraminifers in several assemblages indicate reworking of older units, lack of data on pre-Tortonian faunas of this region precludes recognition of other age-discordant components that could constitute a significant portion of the recovered fauna. The findings of this study revise the prevailing conception of the region's geologic history that considered these units to be early to middle Miocene shelf deposits and indicate that infilling and uplift have characterized the nearshore basins since the late Pliocene.

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“…Discovered in 1574, the earliest geological descriptions of the islands were those of Sutcliffe (1841), who reported a submarine eruption off Punta Bacalao in 1835, and Darwin (1876). Lacroix (1928) described and analysed samples from Robinson Crusoe collected during the Dumont d'Urville expedition of 1838.…”

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confidence: 99%

Geochemical evolution of the Juan Fernandez Islands, SE Pacific

Baker

Gledhill

Harvey

et al. 1987

JGS

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Geological observations on the volcanic islands and parts of South America visited during the voyage of H.M.S. 'Beagle'

Cited by 51 publications

References 0 publications

High-frequency seismic radiation from Maule earthquake (Mw 8.8, 2010 February 27) inferred from high-resolution backprojection analysis

High-frequency seismic radiation from Maule earthquake (Mw 8.8, 2010 February 27) inferred from high-resolution backprojection analysis

Paleontologic Evidence for Sedimentary Displacement in Neogene Forearc Basins of Central Chile

Geochemical evolution of the Juan Fernandez Islands, SE Pacific

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