Hydrothermal temperature changes at the southern Juan de Fuca Ridge associated with MW 6.2 Blanco Transform earthquake

Research Article| February 01, 2003 Hydrothermal temperature changes at the southern Juan de Fuca Ridge associated with MW 6.2 Blanco Transform earthquake Robert P. Dziak; Robert P. Dziak 1Cooperative Institute for Marine Resources Studies, Oregon State University, Hatfield Marine Science Center, Newport, Oregon 97365, USA Search for other works by this author on: GSW Google Scholar William W. Chadwick, Jr.; William W. Chadwick, Jr. 1Cooperative Institute for Marine Resources Studies, Oregon State University, Hatfield Marine Science Center, Newport, Oregon 97365, USA Search for other works by this author on: GSW Google Scholar Christopher G. Fox; Christopher G. Fox 2National Oceanographic and Atmospheric Administration, Pacific Marine Environmental Laboratory, Hatfield Marine Science Center, Newport, Oregon 93765, USA Search for other works by this author on: GSW Google Scholar Robert W. Embley Robert W. Embley 2National Oceanographic and Atmospheric Administration, Pacific Marine Environmental Laboratory, Hatfield Marine Science Center, Newport, Oregon 93765, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Robert P. Dziak 1Cooperative Institute for Marine Resources Studies, Oregon State University, Hatfield Marine Science Center, Newport, Oregon 97365, USA William W. Chadwick, Jr. 1Cooperative Institute for Marine Resources Studies, Oregon State University, Hatfield Marine Science Center, Newport, Oregon 97365, USA Christopher G. Fox 2National Oceanographic and Atmospheric Administration, Pacific Marine Environmental Laboratory, Hatfield Marine Science Center, Newport, Oregon 93765, USA Robert W. Embley 2National Oceanographic and Atmospheric Administration, Pacific Marine Environmental Laboratory, Hatfield Marine Science Center, Newport, Oregon 93765, USA Publisher: Geological Society of America Received: 26 Jun 2002 Revision Received: 15 Oct 2002 Accepted: 17 Oct 2002 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2003) 31 (2): 119–122. https://doi.org/10.1130/0091-7613(2003)031<0119:HTCATS>2.0.CO;2 Article history Received: 26 Jun 2002 Revision Received: 15 Oct 2002 Accepted: 17 Oct 2002 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Robert P. Dziak, William W. Chadwick, Christopher G. Fox, Robert W. Embley; Hydrothermal temperature changes at the southern Juan de Fuca Ridge associated with MW 6.2 Blanco Transform earthquake. Geology 2003;; 31 (2): 119–122. doi: https://doi.org/10.1130/0091-7613(2003)031<0119:HTCATS>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The regional impact of transform seismicity on ridge-crest hydrothermal venting and ridge-transform dynamics is investigated using a June 1–7, 2000, Blanco Transform earthquake sequence. The mainshock (Mw 6.2) and 170 foreshocks and aftershocks were located using T waves recorded on U.S. Navy hydrophones, and indicate that the active transform fault may be farther south than in previous tectonic models. During the earthquake sequence, two temperature probes were deployed in black smoker chimneys at the Vent1 and Plume hydrothermal fields along the southern Juan de Fuca Ridge. These two hydrothermal systems are ∼39 km northwest of the mainshock's acoustic location. Both probes show significant (>5 °C) temperature declines following the mainshock, the Vent1 temperature changes occurring over days to weeks while the Plume changes were coseismic. The Vent1 and Plume fluid temperature decreases are consistent with earthquake-induced changes to permeability in the upper ocean crust. The evidence suggests that deep-ocean hydrothermal systems can be altered by large earthquakes even at a distance and across tectonic provinces, and ridge-crest seismic and magmatic activity are not the only causes of change to hydrothermal systems. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.