Geophysics
Research Discussion Group
(formerly known as The Good, the Bad and the
Ugly Journal Club)
Everyone is welcome to attend.
Thursday in Munk Conference Room, this
term the time is shifted to 11:15-12:15.
Spring 2009
Apr 2 Andrew Kositsky, Caltech will give a
talk " Inverting Geodetic Time Series Using Principal Component
Analysis"
Apr 9 Leah Ziegler will discuss her recent
research "Maximum likelihood modeling of geomagnetic
dipole field strength over the last 2 million years."
Apr 16 journal paper
discussions led by Linghan Li, Xiaowei Chen, and Paula Chojnacki: H. Araki et al., Lunar Global Shape and Polar
Topography Derived from Kaguya-LALT Laser Altimetry, DOI: 10.1126/science.1164 http://www.sciencemag.org/cgi/content/short/323/5916/897
T.
Ono et al., Lunar Radar Sounder Observations of Subsurface Layers Under the
Nearside Maria of the Moon, DOI: 10.1126/science.1165988 http://www.sciencemag.org/cgi/content/short/323/5916/909
J. Haruyama et al., Long-Lived
Volcanism on the Lunar Farside Revealed by SELENE Terrain Camera, DOI:
10.1126/science.1163382 http://www.sciencemag.org/cgi/content/short/323/5916/905
Apr 23 Michael Hedlin will talk about his
research on infrasound, "A new frontier in studying the Earth"
Apr 30 Catherine de
Groot-Hedlin,
will talk about her recent research, "The atmosphere and infrasound
propagation"
May 7 Kris Walker, will talk about
"The science of listening in a turbulent world: Infrasounds arrays,
filters, and algorithms"
May 14 Gabi Laske, will talk about "The Hawaiian
PLUME project- seismology on the ocean floor"
May 21 journal paper
discussions led by Janine Buehler and Zhitu Ma: Kato, A., E. Kurashimo, T. Igarashi, S. Sakai, T.
Iidaka, M. Shinohara, T. Kanazawa, T. Yamada, N. Hirata, and T. Iwasaki (2009),
Reactivation of ancient rift systems triggers devastating intraplate
earthquakes, Geophys. Res. Lett., 36, L05301, doi:10.1029/2008GL036450 http://www.agu.org/journals/gl/gl0905/2008GL036450/
Nakajima,
J., Y. Tsuji, and A. Hasegawa (2009), Seismic evidence for thermally-controlled
dehydration reaction in subducting oceanic crust, Geophys. Res. Lett., 36, L03303,
doi:10.1029/2008GL036865 http://www.agu.org/journals/gl/gl0903/2008GL036865/
May 28 journal paper
discussions led by Ashlee Henig and Mandi Markee:
Cannata et al. (2009), Tracking
eruptive phenomena by infrasound: May 13, 2008 eruption at Mt. Etna, Geophys.
Res. Lett., 36, L05304, doi:10.1029/2008GL036738. http://www.agu.org/pubs/crossref/2009/2008GL036738.shtml
Sgroi, T., C. Montuori,
R. Agrusta, and P. Favali (2009), Low-frequency seismic signals recorded by OBS
at Stromboli volcano (Southern Tyrrhenian Sea), Geophys. Res. Lett., 36,
L04305, doi:10.1029/2008GL036477 http://www.agu.org/pubs/crossref/2009/2008GL036477.shtml
June 4 journal paper discussions led by Andrew
Barbour
and Erica Mitchell:
Timm John, Sergei Medvedev, Lars H.
Rüpke, Torgeir B. Andersen, Yuri Y. Podladchikov & Håkon Austrheim (2009),
Nature Geoscience 2, 137 - 140, doi:10.1038/ngeo419 http://www.nature.com/ngeo/journal/v2/n2/full/ngeo419.html
Meade,
B. J., and J. P. Loveless (2009) Predicting the geodetic signature of MW ≥ 8
slow slip events, , Geophys. Res. Lett., 36, L01306, doi:10.1029/2008GL036364 http://www.agu.org/journals/gl/gl0901/2008GL036364/
June 11 finals week- no
meeting
Suggested
guidelines for Journal Paper Presentations:
- Context of the study: Why is the work
interesting/relevant? What is the basic premise and is it sound or is it
debatable? Does the work break new ground or does it provide a new step
that depends strongly on prior results?
- Background on the authors: What is their field of
expertise? Where are they currently? If multi-authored, what types of
contribution may each author have made to the work? What range of work on
this topic have the main authors done before, if any?
- A brief summary of the paper: (EXPECT that
everyone has read the paper so this is intended as a start to discussion,
not an exhaustive description) What is the new work? What methods were employed?
What is(are) the main finding(s)? What are the implications?
- Discussion: Are there parts of the analysis that
you find particularly strong or weak? How might one improve on any weak
aspects? Does this work provide a comprehensive result (or are there still
'loose ends' that need to be addressed)? Are there related/subsequent
studies that would provide additional insights on the specific topic of
the paper?
___________________________________________________
Winter 2009
Jan 8
Rob Mellors, SDSU will
discuss his recent research: Mud volcanoes,
earthquakes, and InSAR
Jan 15 John Blum will discuss his recent research
"Unexplained Seismicity in
the Gulf of Mexico"
Jan 22 Dave Sandwell " Geodetic Imaging of the Earthquake
Cycle: Tide gauges, GPS, and InSAR"
Jan 29 Raul Castro, CICESI & visiting IGPP
08/09, "Seismicity and body-wave attenuation near the rupture of the 1887
Sonora, Mexico earthquake (Mw 7.5)"
Feb 5 Journal
paper discussions led by Paula Chojnacki PERSPECTIVES: Carbon in Charge, Rob L. Evans, Science 28
November 2008:, Vol. 322. no. 5906, pp. 1338 - 1340, DOI:
10.1126/science.1166260 http://www.sciencemag.org/cgi/content/full/322/5906/1338
and Carbonatite Melts and
Electrical Conductivity in the Asthenosphere, Fabrice Gaillard et al.,
Science 28 November 2008: Vol. 322. no. 5906, pp. 1363 - 1365 DOI:
10.1126/science.1164446 http://www.sciencemag.org/cgi/content/full/322/5906/1363
and Zhitu
Ma Perspectives: Solid
evidence in the inner core Nature 454, p833, Kenneth C.
Creager doi:10.1038/454833a http://www.nature.com/nature/journal/v454/n7206/full/454833a.html and Inner-core shear-wave
anisotropy and texture from an observation of PKJKP waves" James Wookey
& George Helffrich (2008) Nature 454, p873 doi:10.1038/nature07131 http://www.nature.com/nature/journal/v454/n7206/full/nature07131.html
Feb 12 Yoshihiro Kaneko, Caltech grad student,
"Influence of fault friction heterogeneities on earthquake rupture
patterns and interseismic coupling"
Feb 19
Guy Masters will
discuss his recent research on spin transitions
Feb 26
Journal paper discussions led by Erica Mitchell
"Strain accommodation by slow slip and dyking in a youthful
continental rift, East Africa" Eric Calais et al., Nature p788
doi:10.1038/nature07478 http://www.nature.com/nature/journal/v456/n7223/full/nature07478.html.
and Andy
Barbour, A scaling law for slow
earthquakes,
Satoshi Ide, Gregory C. Beroza, David R. Shelly & Takahiko Uchide, Nature
447, 76-79(3 May 2007)
doi:10.1038/nature0578
Mar 5
Journal paper discussions led by Linghan Li Wingham, D. J.
et al. Rapid discharge connects Antarctic subglacial lakes, Nature 440,
doi:10.1038/nature04660 (2006).
and Mandi Markee Earthquake Supercycles Inferred from
Sea-Level Changes Recorded in the Corals of West Sumatra, Kerry Sieh et al.,
Science 12 December 2008: Vol. 322. no. 5908, pp. 1674 - 1678
DOI:10.1126/science.1163589 http://www.sciencemag.org/cgi/content/abstract/322/5908/1674
Mar 12 the Polar Seminar scheduled for 11:00 in
Hubbs Hall is related to discussion we had last week. Please attend if
possible: Dr. Doug MacAyeal, University of Chicago, "Rogue Ice Streams: The awkward
truth about glacial earthquakes, stick-slip kinematics and subglacial lakes in
a world of viscous ice flow"
Fall 2008
Oct 9 Xiaopeng Tong will lead discussion on a journal paper:
Mantle Flow Beneath a Continental Strike-Slip Fault: Postseismic Deformation
After the 1999 Hector Mine Earthquake, Fred F. Pollitz,* Chuck Wicks, Wayne
Thatcher, Science 7 September 2001: Vol. 293. pp. 1814 - 1818, DOI:
10.1126/science.1061361
Oct
16 Brendan Crowell will lead discussion on a journal paper:
Tsuru, T., J.-O. Park, Y. Kido, A. Ito, Y. Kaneda, T.
Yamada, M., Shinohara and T. Kanazawa (2005), Did expanded porous patches guide
rupture propagation in 2003 Tokachi-oki earthquake?, Geophys. Res. Lett., 32,
doi:10.1029/2005GL023753.
Oct
23 Haigai Ron, visiting Oct18-29 from Hebrew
University of Jerusalem– Simple Model explains Complex Faulting: Northern Dead
Sea Transform and the Mojave-Hector Mine earthquakes
Oct
30 Jill Pearse will present a talk on her recent research:
Observations and modelling of the Socorro magma body
Nov
6 Ashlee Henig will lead discussion on the paper:
Tucholke, B., M. Behn, W.R. Buck, J. Lin, Role of melt supply in oceanic
detachment faulting and formation of megamullions, Geology, June 2008; v. 36; no. 6; p. 455–458;
doi: 10.1130/G24639A.1.
Janine Buehler will lead discussion on: Bouchon, M. and H. Karabulut, The Aftershock Signature of Supershear Earthquakes, Science, 6 June 2008: 1323-1325.
Nov
13 Xiaowei Chen will lead discussion on a journal
paper Parsons, Chen and Kirby,
Stress changes from the 2008 Wenchuan earthquake and increased hazard in the
Sichuan basin, Nature 454, 509-510 (24 July 2008) |
doi:10.1038/nature07177
Nov
20 Peter Shearer will present an informal research talk:
Limitations of earthquake triggering models
Dec
4 Lindsay Smith will discuss her research
Dec
11 AGU practice talks
and posters in Munk
hallway; session will probably last ~ 2 hrs and all Earth section students scheduled to
present at AGU are expected to participate (as are their advisors); all Earth
section members are encouraged to attend- pizza and drinks will be provided
Summer 2008 Seminar Series:
July 3 Heiner Igel (visiting IGPP from Ludwig-Maximilians-University,
Germany): Rotational ground motions: a new observable for seismology?
July 10 Deborah
Kane: Estimating seismic source parameters and uncertainties using a
small aperture array
July 17 Heiner Igel:
Advances
in modeling and inversion of seismic waveforms
July 24 Kerry Key Can asymmetric mantle melting beneath the East
Pacific Rise be explained by ridge migration?
July 31 Debi Kilb: Aftershock Triggering: Where, When and How
August 7 Robin Matoza:
The source
of infrasound associated with long-period events at Mount St. Helens
August 14 Stefan Jensen,
summer intern at IGPP: Geophysical surveying for Paleoclimate Proxies in
Fallen Leaf Lake, CA (Jill Pearse's talk postponed until Fall)
August 21 Phil Livermore: Towards
more realistic models of the Earth's dynamo
August 28 Satish Singh IPG Paris
& Green Scholar IGPP:
Relationship
between Sumatra megathrust, backthrust, landslide and tsunami
August 28 SPECIAL TOPIC SEMINAR
3:00 Munk Conference Room Gillian Royle, IPG Paris grad student with Satish
Singh: Viscoelastic
Modeling and Full Waveform Inversion in Attenuating Media
WED Sept 3 SPECIAL SEMINAR 12:00 Munk Conference Room Dave
Gubbins, visiting IGPP from Univ. Leeds UK: Dynamos locked to the
lower mantle anomalies
Sept 4 Roi Granot: magnetic anomalies across fracture zone
Sept 11 postponed due to lack of available room at IGPP this week
TUES
Sept 16 SPECIAL
SEMINAR 2:00 Munk
Conference Room James Hammond, Univ. Bristol UK: Imaging the upper mantle beneath the
Seychelles: Architecture of a microcontinent
Sept 18 Klaus Mosegaard, visiting from University of
Copenhagen: Computational
limits to nonlinear inversion
MON Sept 22 SPECIAL SEMINAR 12:00 Revelle
Conference Room James Wookey visiting IGPP from Univ. Bristol UK: Seismic anisotropy of the
lowermost mantle
Sept 25 Fabio Donadini: Geomagnetic field models for the past 3000 years obtained
using different recorders and data selection