128 research outputs found
Seismic anisotropy reveals a dynamic link between adjacent magmatic segments prior to dyke Intrusion
Get PDFSeismic anisotropy has increasingly been proposed as a tool in the monitoring of magmatic systems and potential forecasting of volcanic eruptions. We present a detailed study of how seismic anisotropy evolves in an active magmatic rift segment before, during, and after a dyke intrusion in the Afar depression, Ethiopia. Results show that seismic anisotropy prior to the dyke intrusion is controlled by a complex and deforming magma plumbing system beneath the adjacent Dabbahu and Manda‐Hararo magmatic segments. Approximately eight days prior to the dyke intrusion in the Dabbahu segment, the pattern of anisotropy, coupled with lower crustal seismicity, is best explained by the inflation of a lower crustal magma reservoir in the Manda‐Hararo segment. This is the only clearly observed precursory change in seismic anisotropy. During the dyke intrusion, the magnitude of seismic anisotropy increases twofold, before rapidly returning to predyke values once the intrusion has ended. Combining our observations with models of magmatically induced crustal stress, we propose that when the deep magma reservoir beneath the Dabbahu segment becomes overpressured, inflation is triggered in the magma reservoir of the neighboring Manda‐Hararo segment. This provides strong evidence for a hydraulic link between the deep magma systems of the neighboring rift segments and that magma reservoirs beneath the Dabbahu segment can be fed by the lateral flow of magma from an adjacent segment. Our results demonstrate that seismic anisotropy has the potential to be a powerful tool for monitoring deformation in the magma plumbing systems of active volcanoes
Paul Foelsche
No full textTim Finnigan, Age 23, with cicatrices, no other embellishments. Iwaidja, worked for Searcy. Port Essington.Perry, Lindsay F
Oligo-Miocene oxygen isotope and carbon record from IODP Site 342-U1406
No full textThese data contain a new high-resolution benthic foraminiferal oxygen isotope (d18Ob) record spanning ~26-22 Ma from Integrated Ocean Drilling Program Expedition 342 Site U1406 (Newfoundland Margin, Northwest Atlantic Ocean, ~40°N, 51°W; 3.8 km water depth). Oxygen isotopes of Cibicidoides mundulus (size range 125-250 micrometer) were generated using a Thermo Fisher Scientific MAT 253 mass-spectrometer coupled to a Thermo-Finnigan Kiel IV Carbonate Device in Southampton, Heidelberg, and Leipzig, and coupled to a Gasbench II in Frankfurt. International standards (NBS-18 and NBS-19) and in-house quality control standards were used to calibrate d18Ob. The record was astronomically tuned by recognising obliquity cycles in the X-ray fluorescence based CaCO3 record using newly generated coulometric carbonate content data (wt.% CaCO3), generated at the University of Southampton's Waterfront Campus, National Oceanography Centre Southampton (UoS-NOCS), using a CM5015 coulometer equipped with an AutoMate automated analysis devic
Design Requirement of a Renewable Energy Plus Compressed Air Energy Storage and Regeneration System
No full textCarbon, nitrogen and stable carbon isotopes in the sediment core E46 from Eastern Segara Anakan, Indonesia
No full textWhat was sampled: Mangrove sediment
Parameter measured and method:
1. Organic carbon (Corg), analyzed using elemental analyzer (Eurovector E3000 Elemental Analyzer)
2. Total nitrogen (N), analyzed using elemental analyzer (Eurovector E3000 Elemental Analyzer)
3. Stable carbon isotope composition (δ13Corg), analyzed using Thermo Finnigan Delta plus mass spectrometer coupled to a Flash EA1112 Elemental Analyzer
Where was sampled: Eastern Segara Anakan Lagoon, Central Java, Indonesia
When was sampled: Sediment samples were taken in December 2016.
How it was sampled: Mangrove sediments were collected using a 1 m long semi-cylindrical auger. Sediments were taken down to 1 m depth, and were sampled in 5 cm interval
Carbon, nitrogen and stable carbon isotopes in the sediment core E44 from Eastern Segara Anakan, Indonesia
No full textWhat was sampled: Mangrove sediment
Parameter measured and method:
1. Organic carbon (Corg), analyzed using elemental analyzer (Eurovector E3000 Elemental Analyzer)
2. Total nitrogen (N), analyzed using elemental analyzer (Eurovector E3000 Elemental Analyzer)
3. Stable carbon isotope composition (δ13Corg), analyzed using Thermo Finnigan Delta plus mass spectrometer coupled to a Flash EA1112 Elemental Analyzer
Where was sampled: Eastern Segara Anakan Lagoon, Central Java, Indonesia
When was sampled: Sediment samples were taken in December 2016.
How it was sampled: Mangrove sediments were collected using a 1 m long semi-cylindrical auger. Sediments were taken down to 1 m depth, and were sampled in 5 cm interval
Carbon, nitrogen and stable carbon isotopes in the sediment core K1 from Kongsi Island, Indonesia
No full textWhat was sampled: Mangrove sediment
Parameter measured and method:
1. Organic carbon (Corg), analyzed using elemental analyzer (Eurovector E3000 Elemental Analyzer)
2. Total nitrogen (N), analyzed using elemental analyzer (Eurovector E3000 Elemental Analyzer)
3. Stable carbon isotope composition (δ13Corg), analyzed using Thermo Finnigan Delta plus mass spectrometer coupled to a Flash EA1112 Elemental Analyzer
Where was sampled: Kongsi Island, Thousand Islands Marine National Park, Jakarta, Indonesia
When was sampled: Sediment samples were taken in December 2016.
How it was sampled: Mangrove sediments were collected using a 1 m long semi-cylindrical auger. Sediments were taken down to 1 m depth, and were sampled in 5 cm interva
Carbon, nitrogen and stable carbon isotopes in the sediment core E16 from Eastern Segara Anakan, Indonesia
No full textWhat was sampled: Mangrove sediment
Parameter measured and method:
1. Organic carbon (Corg), analyzed using elemental analyzer (Eurovector E3000 Elemental Analyzer)
2. Total nitrogen (N), analyzed using elemental analyzer (Eurovector E3000 Elemental Analyzer)
3. Stable carbon isotope composition (δ13Corg), analyzed using Thermo Finnigan Delta plus mass spectrometer coupled to a Flash EA1112 Elemental Analyzer
Where was sampled: Eastern Segara Anakan Lagoon, Central Java, Indonesia
When was sampled: Sediment samples were taken in December 2016.
How it was sampled: Mangrove sediments were collected using a 1 m long semi-cylindrical auger. Sediments were taken down to 1 m depth, and were sampled in 5 cm interval
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