Publications
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Report of the IAU Working Group on cartographic coordinates and rotational elements: 2009
Every three years the IAU Working Group on Cartographic Coordinates and Rotational Elements revises tables giving the directions of the poles of rotation and the prime meridians of the planets, satellites, minor planets, and comets. This report takes into account the IAU Working Group for Planetary System Nomenclature (WGPSN) and the IAU Committee on Small Body Nomenclature (CSBN) definition of dw
Authors
Brent A. Archinal, Michael F. A’Hearn, Edward Bowell, Al Conrad, Guy J. Consolmagno, Regis Courtin, Toshio Fukushima, Daniel Hestroffer, James L. Hilton, Georgij A. Krasinsky, Gregory Neumann, Jürgen Oberst, P. Kenneth Seidelmann, Philip Stooke, David J. Tholen, Peter C. Thomas, Iwan P. Williams
The role of water in generating the calc-alkaline trend: New volatile data for aleutian magmas and a new tholeiitic index
The origin of tholeiitic (TH) versus calc-alkaline (CA) magmatic trends has long been debated. Part of the problem stems from the lack of a quantitative measure for the way in which a magma evolves. Recognizing that the salient feature in many TH–CA discrimination diagrams is enrichment in Fe during magma evolution, we have developed a quantitative index of Fe enrichment, the Tholeiitic Index (THI
Authors
Mindy M. Zimmer, Terry Plank, Erik H. Hauri, Gene Yogodzinski, Peter L. Stelling, Jessica Larsen, Brad Singer, Brian R. Jicha, Charlie Mandeville, Christopher J. Nye
New insight into lunar impact melt mobility from the LRO camera
The Lunar Reconnaissance Orbiter Camera (LROC) is systematically imaging impact melt deposits in and around lunar craters at meter and sub-meter scales. These images reveal that lunar impact melts, although morphologically similar to terrestrial lava flows of similar size, exhibit distinctive features (e.g., erosional channels). Although generated in a single rapid event, the post-impact mobility
Authors
Veronica J. Bray, Livio L. Tornabene, Laszlo P. Keszthelyi, Alfred S. McEwen, B. Ray Hawke, Thomas A. Giguere, Simon A. Kattenhorn, William B. Garry, Bashar Rizk, C.M. Caudill, Lisa R. Gaddis, Carolyn H. van der Bogert
High‐resolution locations of triggered earthquakes and tomographic imaging of Kilauea Volcano's south flank
The spatiotemporal patterns of seismicity beneath Kilauea's south flank give insight to the structure and geometry of the decollement on which large, tsunamigenic earthquakes have occurred, and its relation to slow slip events (SSEs), which have been observed every 1 to 2 years since 1997. In order to record earthquakes triggered by a SSE that was predicted to occur in March 2007, a temporary netw
Authors
Ellen M. Syracuse, Clifford H. Thurber, Cecily Wolfe, Paul G. Okubo, James H. Foster, Benjamin A. Brooks
Implications of ground-deformation measurements across earth fissures in subsidence areas in the southwestern USA
Ground deformation was monitored at earth fissures in areas of land subsidence induced by groundwater extraction in the southwestern United States. The ground deformation is consistent with the mechanism that fissures are caused by horizontal strains generated by bending of overburden in response to localized differential compaction. Subsidence profiles indicated that localized differential subsid
Authors
Thomas L. Holzer
Earthquakes in the Central United States, 1699-2010
This publication is an update of an earlier report, U.S. Geological Survey (USGS) Geologic Investigation I-2812 by Wheeler and others (2003), titled ?Earthquakes in the Central United States-1699-2002.? Like the original poster, the center of the updated poster is a map showing the pattern of earthquake locations in the most seismically active part of the central United States. Arrayed around the
Authors
Richard L. Dart, Christina M. Volpi
Modified Mercalli intensity assignments for the May 16, 1909, Northern Plains earthquake
We use newspaper accounts from the United States and Canada to assign modified Mercalli intensity (MMI) at 90 towns for the May 16, 1909 Northern Plains earthquake. Our MMI assignments generally are consistent with those plotted on Nuttli's (1976) isoseiemal map. The earthquake was felt over more than 1,500,000 km2 in the states of Minnesota, Montana, North Dakota, South Dakota, and Wyoming and th
Authors
W. H. Bakun, M. C. Stickney, G. Rogers, J. Ristau
Detection and mapping of hydrocarbon deposits on Titan
We report the identification of compounds on Titan's surface by spatially resolved imaging spectroscopy methods through Titan's atmosphere, and set upper limits to other organic compounds. We present evidence for surface deposits of solid benzene (C6H6), solid and/or liquid ethane (C2H6), or methane (CH4), and clouds of hydrogen cyanide (HCN) aerosols using diagnostic spectral features in data fro
Authors
Roger N. Clark, J. M. Curchin, Jason W. Barnes, Ralf Jaumann, Laurence A. Soderblom, Dale P. Cruikshank, Robert H. Brown, Sebastien Rodriguez, Jonathan Lunine, Katrin Stephan, Todd M. Hoefen, Stephane Le Mouelic, Christophe Sotin, Kevin H. Baines, Bonnie J. Buratti, Philip D. Nicholson
Lessons from (triggered) tremor
I test a “clock-advance” model that implies triggered tremor is ambient tremor that occurs at a sped-up rate as a result of loading from passing seismic waves. This proposed model predicts that triggering probability is proportional to the product of the ambient tremor rate and a function describing the efficacy of the triggering wave to initiate a tremor event. Using data mostly from Cascadia, I
Authors
Joan Gomberg
Hydrovolcanic features on Mars: Preliminary analysis of one Mars year of HiRISE observations
We provide an overview of features indicative of the interaction between water and lava and/or magma on Mars as seen by the High Resolution Imaging Science Experiment (HiRISE) camera during the Primary Science Phase of the Mars Reconnaissance Orbiter (MRO) mission. The ability to confidently resolve meter-scale features from orbit has been extremely useful in the study of the most pristine example
Authors
Laszlo P. Keszthelyi, Windy L. Jaeger, Colin M. Dundas, Sara Martinez-Alonso, Alfred S. McEwen, Moses P. Milazzo
Fundamental changes in the activity of the natrocarbonatite volcano Oldoinyo Lengai, Tanzania
On September 4, 2007, after 25 years of effusive natrocarbonatite eruptions, the eruptive activity of Oldoinyo Lengai (OL), N Tanzania, changed abruptly to episodic explosive eruptions. This transition was preceded by a voluminous lava eruption in March 2006, a year of quiescence, resumption of natrocarbonatite eruptions in June 2007, and a volcano-tectonic earthquake swarm in July 2007. Despite t
Authors
Matthieu Kervyn, Gerald G.J. Ernst, Jörg Keller, R. Greg Vaughan, Jurgis Klaudius, Evelyne Pradal, Frederic Belton, Hannes B. Mattsson, Evelyne Mbede, Patric Jacobs
Maps and documentation of seismic CPT soundings in the central, eastern, and western United States
Nine hundred twenty seven seismic cone penetration tests (CPT) in a variety of geologic deposits and geographic locations were conducted by the U.S. Geological Survey (USGS) primarily between 1998 and 2008 for the purpose of collecting penetration test data to evaluate the liquefaction potential of different types of surficial geologic deposits (table 1). The evaluation is described in Holzer and
Authors
Thomas L. Holzer, Thomas E. Noce, Michael J. Bennett