scholarly journals Supplemental Material: Sedimentary response of a structural estuary to Holocene coseismic subsidence

2021 ◽  
Author(s):  
Laura C. Reynolds ◽  
et al.
Keyword(s):  
Coseismic Subsidence

Supplemental Materials 1 (supplemental figures S1, S2, S3, S4); Supplemental Materials 2 (Table S1. Core Information); Supplemental Materials 3 (Bacon and OxCal Scripts); and Supplemental Materials 4 (Invertebrate depth references).

INTER- AND INTRA-SITE VARIABILITY OF COSEISMIC SUBSIDENCE ESTIMATES FROM NORTHERN HUMBOLDT BAY, CALIFORNIA

2017 ◽  
Author(s):  
J. Scott Padgett ◽  
◽  
Simon E. Engelhart ◽  
Harvey Kelsey ◽  
Robert C. Witter
Keyword(s):  
Coseismic Subsidence ◽  
Site Variability

scholarly journals Stratigraphic record of Holocene coseismic subsidence, Padang, West Sumatra

2011 ◽  
Vol 116 (B11) ◽  
pp. n/a-n/a ◽  
Author(s):  
Tina Dura ◽  
Charles M. Rubin ◽  
Harvey M. Kelsey ◽  
Benjamin P. Horton ◽  
Andrea Hawkes ◽  
...  
Keyword(s):  
Stratigraphic Record ◽  
West Sumatra ◽  
Coseismic Subsidence

Crustal Deformation Associated with the 2011 Tohoku-Oki Earthquake: An Overview

2013 ◽  
Vol 29 (1_suppl) ◽  
pp. 81-98 ◽  
Author(s):  
Manabu Hashimoto
Keyword(s):  
Crustal Deformation ◽  
Large Displacements ◽  
Sea Floor ◽  
Gps Network ◽  
Coseismic Subsidence ◽  
Japanese Islands ◽  
East West

The 2011 Tohoku-oki earthquake generated large displacements in and around the Japanese islands that were detected by the nationwide GPS network, sea-floor geodetic surveys, and space-borne radars. The east-west extension exerted on the Japanese islands by this event induced inland events of Mw6 or larger earthquakes. Coseismic subsidence of up to 1 m was observed along the coast where subsidence was found during the interseismic period. This observation contradicts expectations based on the concept of the recurrence of inter-plate earthquakes. Therefore, postseismic motions or other large events are expected to resolve this paradox.

scholarly journals Evidence for coseismic subsidence events in a southern California coastal saltmarsh

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Robert Leeper ◽  
Brady Rhodes ◽  
Matthew Kirby ◽  
Katherine Scharer ◽  
Joseph Carlin ◽  
...  
Keyword(s):  
Southern California ◽  
Coseismic Subsidence

scholarly journals Pre-, Co-, and Post-Seismic Deformation of the 2011 Tohoku-Oki Earthquake and its Implication to a Paradox in Short-Term and Long-Term Deformation

2014 ◽  
Vol 9 (3) ◽  
pp. 294-302 ◽  
Author(s):  
Takuya Nishimura ◽  
Keyword(s):  
Pacific Coast ◽  
Postseismic Deformation ◽  
Plate Interface ◽  
Northeastern Japan ◽  
The Pacific ◽  
Constant Rate ◽  
Geologic Time Scale ◽  
Seismic Deformation ◽  
Coseismic Subsidence

The 2011 Tohoku-oki earthquake caused large eastward displacement and subsidence along the Pacific coast of northeastern Japan. This earthquake partly solved a well-known paradox holding that sense and rate of deformation differ greatly between geologic and geodetic estimates. A paradox remains, however, in explaining long-term uplift along the Pacific coast on a geologic time-scale. Geodetic data show that coastal subsidence continued at a nearly constant rate of ∼5 mm/yr with small fluctuations associated with M7-8 interplate earthquakes for ∼120 years before the Tohoku-oki earthquake. In an area near the Oshika Peninsula where coseismic subsidence is largest, extrapolation of a logarithmic function fitting observed postseismic deformation suggests that coseismic subsidence may be compensated for by the postseismic uplift for several decades but it is difficult to expect the postseismic uplift exceeding 2 meters, so it is implausible that the observed rapid subsidence continued throughout an entire interseismic period in a great megathrust earthquake cycle. We propose a hypothetical model in which the sense of vertical deformation changes from uplift to subsidence during the interseismic period. Using simple elastic dislocation theory, this model is explained by the shallow coupled part of a plate interface in an early interseismic period and the deep coupled part of a late interseismic period.

scholarly journals Impact of a high rainfall event on the water level, current velocity, and total suspended solids in tidal flats environments of the estuarine Cruces River wetland, south-central Chile

2021 ◽  
Vol 49 (1) ◽  
pp. 188-192
Author(s):  
Mario Manzano ◽  
Eduardo Jaramillo ◽  
Mario Pino
Keyword(s):  
Surface Waters ◽  
Suspended Solids ◽  
Environmental Variability ◽  
Total Suspended Solids ◽  
Tidal Flats ◽  
Rainfall Event ◽  
Rainfall Events ◽  
Central Chile ◽  
South Central ◽  
Coseismic Subsidence

The effects of a sudden rainfall (40 mm d-1) event on the surface waters covering muddy tidal flats were studied during April 2016 at the estuarine Cruces River wetland in south-central Chile (~40ºS). The study area included flooded vestigial tree trunks, which is evidence of coseismic subsidence associated with the 1960 Valdivia earthquake as a source of environmental variability. The tidal flat with vestigial tree trunks registered the fastest and highest depth of inundation. In contrast, the tidal currents velocity and total suspended solids' concentrations were higher at the flat without trunks. Sudden rainfall events can significantly modify the characteristics of surface waters above sedimentary intertidal surfaces, where structures such as flooded trunks are present.

scholarly journals Sedimentary response of a structural estuary to Holocene coseismic subsidence

2021 ◽  
Author(s):  
Laura C. Reynolds ◽  
Alexander R. Simms ◽  
Thomas K. Rockwell ◽  
Yusuke Yokoyama ◽  
Yosuke Miyairi ◽  
...  
Keyword(s):  
Late Holocene ◽  
Marsh Surface ◽  
Strike Slip ◽  
Abrupt Increase ◽  
Sediment Compaction ◽  
Show Evidence ◽  
Marine Influence ◽  
Tectonic Settings ◽  
Coseismic Subsidence ◽  
Made In

Stratigraphic evidence for coseismic subsidence has been documented in active-margin estuaries throughout the world. Most of these studies have been conducted in subduction zone or strike-slip settings; however, the stratigraphic response to coseismic subsidence in other tectonic settings would benefit from further study. Here we show evidence of late Holocene coseismic subsidence in a structural estuary in southern California. Below the modern marsh surface, an organic-rich mud containing marsh gastropods, foraminifera, and geochemical signatures indicative of terrestrial influence (mud facies) is sharply overlain by a blue-gray sand containing intertidal and subtidal bivalves and geochemical signatures of marine influence (gray sand facies). We use well-established criteria to interpret this contact as representing an abrupt 1.3 ± 1.1 m rise in relative sea level (RSL) generated by coseismic subsidence with some contribution from sediment compaction and/or erosion. The contact dates to 1.0 ± 0.3 ka and is the only event indicative of rapid RSL rise in the 7 k.y. sedimentary record studied. Consistent with observations made in previous coseismic subsidence studies, an acceleration in tidal-flat sedimentation followed this abrupt increase in accommodation; however, the recovery of the estuary to its pre-subsidence elevations was spatially variable and required 500−900 years, which is longer than the recovery time estimated for estuaries with larger tidal ranges and wetter climates.

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