Uploaded are x-ray computed microtomographic (XRCT) images used to examine solid-fluid interactions within near-surface cores of sediments surrounding the fault strand that slipped during a circa (ca.) 1726 San Andreas Fault zone earthquake. The study site is 16 km northwest of Bombay Beach, California (33.45873, -115.8560), and our samples, collected at depths less than 2 m below sea level, are from a trench that exposes deposits of ancient Lake Cahuilla. The ca. 1726 earthquake occurred during a highstand of ancient Lake Cahuilla; our study site was ~55 m below the lake's surface at the time. Crustal deformation caused by the ca. 1726 earthquake has been documented for at least 85 km along the southernmost San Andreas fault zone, which has been used, alongside other observations, to constrain the earthquake's size to a magnitude 7.2 or larger with offsets on the order of ~3 m. Since the ca. 1726 earthquake, creep and triggered slip have occurred along the section of the fault we study, with estimates of ~3 mm/yr of motion over the last ~160 years.We acquire XRCT images at the Advanced Light Source (ALS), Lawrence Berkeley National Lab, on beamline 8.3.2 and at the University of Texas High-Resolution XRCT Facility, using a Zeiss Xradia 620 Versa scanner. Imaging at ALS uses a 50 mm LuAG scintillator, PCO Edge camera, and 2X Nikon lens. We image with white light x-rays, 13 ms exposure times, and 2625 projections through 180-degree continuous sample rotations. This produces 1280 two-dimensional image slices with voxels' linear dimensions of 3.24 microns. We reconstruct the beamline images and perform ring removal, center of rotation optimizations, and outlier removal using TomoPy.  The Zeiss Xradio 620 Versa scanning parameters are 100kV radiation dose, 14 W power, 0.05s acquisition time, and five samples per view. We reconstructed these images with the Xradia Reconstructor software: center shift -2.739, beam hardening 0.8, theta 0, byte scaling [-0.03, 1.5], and binning of 1. The voxel linear dimensions of these images are 4 microns.

Uploaded are x-ray computed microtomographic (XRCT) images used to examine solid-fluid interactions within near-surface cores of sediments surrounding the fault strand that slipped during a circa (ca.) 1726 San Andreas Fault zone earthquake. The study site is 16 km northwest of Bombay Beach, California (33.45873, -115.8560), and our samples, collected at depths less than 2 m below sea level, are from a trench that exposes deposits of ancient Lake Cahuilla. The ca. 1726 earthquake occurred during a highstand of ancient Lake Cahuilla; our study site was ~55 m below the lake's surface at the time. Crustal deformation caused by the ca. 1726 earthquake has been documented for at least 85 km along the southernmost San Andreas fault zone, which has been used, alongside other observations, to constrain the earthquake's size to a magnitude 7.2 or larger with offsets on the order of ~3 m. Since the ca. 1726 earthquake, creep and triggered slip have occurred along the section of the fault we study, with estimates of ~3 mm/yr of motion over the last ~160 years.We acquire XRCT images at the Advanced Light Source (ALS), Lawrence Berkeley National Lab, on beamline 8.3.2 and at the University of Texas High-Resolution XRCT Facility, using a Zeiss Xradia 620 Versa scanner. Imaging at ALS uses a 50 mm LuAG scintillator, PCO Edge camera, and 2X Nikon lens. We image with white light x-rays, 13 ms exposure times, and 2625 projections through 180-degree continuous sample rotations. This produces 1280 two-dimensional image slices with voxels' linear dimensions of 3.24 microns. We reconstruct the beamline images and perform ring removal, center of rotation optimizations, and outlier removal using TomoPy.  The Zeiss Xradio 620 Versa scanning parameters are 100kV radiation dose, 14 W power, 0.05s acquisition time, and five samples per view. We reconstructed these images with the Xradia Reconstructor software: center shift -2.739, beam hardening 0.8, theta 0, byte scaling [-0.03, 1.5], and binning of 1. The voxel linear dimensions of these images are 4 microns.

Uploaded are x-ray computed microtomographic (XRCT) images used to examine solid-fluid interactions within near-surface cores of sediments surrounding the fault strand that slipped during a circa (ca.) 1726 San Andreas Fault zone earthquake. The study site is 16 km northwest of Bombay Beach, California (33.45873, -115.8560), and our samples, collected at depths less than 2 m below sea level, are from a trench that exposes deposits of ancient Lake Cahuilla. The ca. 1726 earthquake occurred during a highstand of ancient Lake Cahuilla; our study site was ~55 m below the lake's surface at the time. Crustal deformation caused by the ca. 1726 earthquake has been documented for at least 85 km along the southernmost San Andreas fault zone, which has been used, alongside other observations, to constrain the earthquake's size to a magnitude 7.2 or larger with offsets on the order of ~3 m. Since the ca. 1726 earthquake, creep and triggered slip have occurred along the section of the fault we study, with estimates of ~3 mm/yr of motion over the last ~160 years.We acquire XRCT images at the Advanced Light Source (ALS), Lawrence Berkeley National Lab, on beamline 8.3.2 and at the University of Texas High-Resolution XRCT Facility, using a Zeiss Xradia 620 Versa scanner. Imaging at ALS uses a 50 mm LuAG scintillator, PCO Edge camera, and 2X Nikon lens. We image with white light x-rays, 13 ms exposure times, and 2625 projections through 180-degree continuous sample rotations. This produces 1280 two-dimensional image slices with voxels' linear dimensions of 3.24 microns. We reconstruct the beamline images and perform ring removal, center of rotation optimizations, and outlier removal using TomoPy.  The Zeiss Xradio 620 Versa scanning parameters are 100kV radiation dose, 14 W power, 0.05s acquisition time, and five samples per view. We reconstructed these images with the Xradia Reconstructor software: center shift -2.739, beam hardening 0.8, theta 0, byte scaling [-0.03, 1.5], and binning of 1. The voxel linear dimensions of these images are 4 microns.

This composite report includes data from two analyses (total carbon from Elemental analysis [CHNS], and inorganic carbon from [Coulometer]). Each row combines the CHNS and Coulometer data from measurements made on the same sample at the same time for a particular section and section offset (depth). If data do not exist for a particular expedition, the column does not appear. To identify individual samples and tests, see each separate data type (Elemental analysis and Coulometer). If the same sample was measured multiple times by any of the methods, results in the report will be combined on one line where possible. Each additional replicate result will be shown in subsequent rows and will be combined where possible. Report includes results for carbon forms: total, inorganic, calcium carbonate, and organic by difference, along with total hydrogen, nitrogen, and sulfur.

A digital composite image (PNG) is made for each core comprising core sections scanned using a line-scan camera. The composite layout is equivalent to traditional core table photos. Top left is top of core; color and meter rule references are included.

Close-up images taken by digital cameras as requested by the science party, typically when the section-half image is not sufficient. Close-up photographs of the areas of interest may be taken from whole-round sections, pieces, or section halves in sediments and rock.

Close-up images taken by digital cameras as requested by the science party, typically when the section-half image is not sufficient. Close-up photographs of the areas of interest may be taken from whole-round sections, pieces, or section halves in sediments and rock.

Fundamental elemental component (total carbon, hydrogen, nitrogen, and sulfur) fluctuations help define the origin, depositional environment, and diagenetic alteration of source materials. To determine C, H, N, and S, solid samples are reacted with a catalyst, separated by chromatography, and detected by thermal conductivity on a FlashEA 1112 CHNS elemental analyzer. Organic carbon can be directly measured on the elemental analyzer by acidification of the sample to drive off carbonate as carbon dioxide before analyzing. Total organic carbon on this report is measured rather than calculated.

Fundamental elemental component (total carbon, hydrogen, nitrogen, and sulfur) fluctuations help define the origin, depositional environment, and diagenetic alteration of source materials. To determine C, H, N, and S, solid samples are reacted with a catalyst, separated by chromatography, and detected by thermal conductivity on a FlashEA 1112 CHNS elemental analyzer. Organic carbon can be directly measured on the elemental analyzer by acidification of the sample to drive off carbonate as carbon dioxide before analyzing. Total organic carbon on this report is measured rather than calculated.

This composite report includes data from two analyses (total carbon from Elemental analysis [CHNS], and inorganic carbon from [Coulometer]). Each row combines the CHNS and Coulometer data from measurements made on the same sample at the same time for a particular section and section offset (depth). If data do not exist for a particular expedition, the column does not appear. To identify individual samples and tests, see each separate data type (Elemental analysis and Coulometer). If the same sample was measured multiple times by any of the methods, results in the report will be combined on one line where possible. Each additional replicate result will be shown in subsequent rows and will be combined where possible. Report includes results for carbon forms: total, inorganic, calcium carbonate, and organic by difference, along with total hydrogen, nitrogen, and sulfur.