Zobrazeno 1 - 10
of 18
pro vyhledávání: '"Mark A. Helper"'
Publikováno v:
Bulletin of Volcanology. 84
The effects of pyroclastic density currents (PDCs) can be devastating, so understanding their internal dynamics and evolution is important for hazard assessment. We use damaged trees located around Mount St. Helens (USA) as proxy for the dynamic pres
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f95f98491bbb3023c3ca9b074c646ba0
https://doi.org/10.1007/s00445-022-01548-6
https://doi.org/10.1007/s00445-022-01548-6
Publikováno v:
Geosphere. 15:820-838
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7b92ea774f22a90842e100454764a9ab
https://doi.org/10.1130/ges02017.1
https://doi.org/10.1130/ges02017.1
Publikováno v:
Geochemistry, Geophysics, Geosystems
Geochemistry, Geophysics, Geosystems, 22 (3)
Geochemistry, Geophysics, Geosystems : G(3)
Geochemistry, Geophysics, Geosystems, 22 (3)
Geochemistry, Geophysics, Geosystems : G(3)
The architecture and mechanical properties of the subduction interface impact large‐scale subduction processes, including mass and volatile recycling, upper‐plate orogenesis, and seismic behavior. The nature of the deep subduction interface, wher
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1f732e606affee22e785af5101ef6b1c
The low velocity layer (LVL) in modern subduction zones is a 3-5 km thick region that parallels the top of the downgoing slab and is characterized by anomalously high Vp/Vs ratios (1.8-2.5) consistent with 2.5-4% fracture porosity at near-lithostatic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b544986e48d08b92a8579b575473f079
https://doi.org/10.5194/egusphere-egu2020-3285
https://doi.org/10.5194/egusphere-egu2020-3285
Tree damage can provide insights into internal dynamic pressure changes of pyroclastic density currents (PDC). On 18 May 1980, Mount St. Helens erupted a laterally directed PDC that decimated ~600k...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d821b2f1bc07ed611b20d6c1f6d3227d
https://doi.org/10.1002/essoar.10501835.1
https://doi.org/10.1002/essoar.10501835.1
Publikováno v:
Geology. 46:795-798
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ecd67b09afffeee1d7b7f0dec504a2fe
https://doi.org/10.1130/g45353.1
https://doi.org/10.1130/g45353.1
Autor:
Carla Klehm, Elisabeth Hildebrand, Elizabeth A. Sawchuk, Katherine M. Grillo, Susan Pfeiffer, Purity Kiura, John J. Shea, Lawrence B. Conyers, Austin Chad Hill, Emmanuel Ndiema, Anneke Janzen, Hong Wang, Steven T. Goldstein, Cecilia Ngugi, Mark A. Helper
Publikováno v:
Proceedings of the National Academy of Sciences of the United States of America
Archaeologists have long sought monumental architecture’}s origins among societies that were becoming populous, sedentary, and territorial. In sub-Saharan Africa, however, dispersed pastoralists pioneered monumental construction. Eastern Africa{’
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5e4e92cfeb81b776463a74e74479beab
https://hdl.handle.net/21.11116/0000-0001-F50B-F21.11116/0000-0001-F509-1
https://hdl.handle.net/21.11116/0000-0001-F50B-F21.11116/0000-0001-F509-1
Autor:
Jacob E. Bleacher, José M. Hurtado, Mark A. Helper, Trevor G. Graff, Cynthia A. Evans, Ryan A. Zeigler, Barbara J. Tewksbury, Dean Eppler, Kelsey Young
Publikováno v:
Geological Society of America Abstracts with Programs.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::91768d46282157c928a80fdc2da39bc9
https://doi.org/10.1130/abs/2018rm-313741
https://doi.org/10.1130/abs/2018rm-313741
Autor:
Mark A. Helper, Ronald J. Steel, M.A. Hamdan, Cornel Olariu, Safiya M. Hassan, Ahmed El Barkooky
Publikováno v:
Sedimentary Geology. 282:241-255
The net transgressive Lower Miocene Moghra Formation of Egypt is a sandy estuarine complex consisting of a series of stratigraphic units that reflect repeated transgressive to regressive shoreline movements across the Burdigalian (Lower Miocene) coas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::893866ba284374c52466995a38fb7841
https://doi.org/10.1016/j.sedgeo.2012.09.013
https://doi.org/10.1016/j.sedgeo.2012.09.013
Publikováno v:
Geological Society of America Abstracts with Programs.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::494661a459e0cc3ac75438b61d71d3f2
https://doi.org/10.1130/abs/2016am-283724
https://doi.org/10.1130/abs/2016am-283724