Jonathan M. Lees
|
|
Map Of ResearchMt.St.
Helens Tomography
Stromboli/EtnaSide Edge of Kamchatka SlabTungurahuaIceland\SIFKRA.htmHengill 2005Revententador 2005 |
Professor, Geophysics
University of North Carolina, Chapel Hill
Email: jonathan.lees@unc.eduLinks to UNC Home Page or Geological Sciences Home Page
Crustal seismology, seismic imaging, tomography, volcano seismology, geophysical signal analysis
Prof. Lees participates in the Carolina Speakers Club
Prof. Lees will give a public lecture: Announcement
Research Program:
My main research program is directed at a broad understanding of lithosphere structure and processes including recent volcanism, active faulting, geothermal fluid flow and mechanisms of deformation. I am building models that explain diverse geophysical and geological observations, such as the geometry and physical characteristics of magma accumulations, the three-dimensional distribution of geophysical anomalies the control faulting, and the relationship of micro-seismicity to fluid flow, crack density in regions of elevated temperature.
Primary focus is given to regions where the dynamics of the subsurface can be explored structurally, geologically and physically. My main contribution has been in the area of seismic tomographic imaging, the three-dimensional distribution of velocity, attenuation, and anisotropy of seismic waves in complex media. I am especially interested in coordinating joint analyses of diverse data sets including gravity, aeromagnetic, heat flow, stress distribution and geology to quantitatively constrain models of the subsurface.
STROBE: Stromboli-Etna, 2001
In May, 2001, reasearchers from the University of North Carolina, University of Florence, University of Hawaii, Geomar (Germany) participated in an intensive monitoring effort coordinating numerous scientific investigation of the explosive behavior of these extremely active volcanoes. Jonathan Lees and student April McGreger installed broadband seismic equipment and infrasonic microphones to examine the nature of explosive activity and harmonic tremor at the volcano vents.
Lees' STROBE Web Page includes many seismograms
UNC-CH Student: April McGreger's Stromboli Web Page
KAMCHATKA: Investigating the Edge of a Plate.
Read a short article about the seismic experiment that changes the way we think
about plate subduction and mantle dynamics.
Side Edge of Kamchatka Slab:
For More See J. M. Lees Research Summary
Geographic Areas Studied:
|
Active Volcanoes Stromboli Volcano |
San Andreas Fault Parkfield |
Geothermal Research |
Puget Sound,
Washington |
Side Edge of Kamchatka Slab:
Recently we have been funded to examine the upper mantle in a long term IRIS-PASSCAL experiment in Kamchatka, Russia.
For a description of our experiment, see SEKS
Software developed:
· Geotouch: Three-dimensional GIS for Geology and Geophysics.
· Geotouch: Published Paper in Computers and geosciences:
· Multi-Taper Spectral Methods
Classes taught:
Introduction to Seismology, Inverse Theory, Advanced Seismology, Signal Analysis.
GEOL 006:
Volcanoes and Civilization
GEOL 142:
Introduction to Geophysics
GEOL 152:
Data Analysis in the Earth Sciences
Geol 154:
Physical Volcanology
Older Syllabi
Active Tectonics
Click here to see Prof. Lees in action
New PASSCAL Experiment Funded:
Side Edge of Kamchatka Slab
Click
PHOTO GALLERY
To see some photos of my recent trip to Karymsky Volcano, Kamchatka, Russia: Click:
1996 Kamchatka Expedition:
· Karymsky Map of Lava Flow (work of Alexei Ozerov)
· Karymsky Map Station Deployment
1997 Kamchatka Expedition:
|
|
|
|
|
1997 Kamchatka Expedition: |
|||
· Karymsky 1997 Expedition Team
Other Photos of interest:
· Lees at Mount Rainier Transect Shot (1995)
· Lees at Mount St. Helens Crater (1984)
· Massive fault at Landers California (1992)
· Lees at Hawaii Lava Flow (1993)
· Lees in High Sierras: Southern Sierra Seismic Transect (1992)
· Lees on Red Hill, Coso, California (1990)
Computing System:
PUBLISHED JOURNAL PAPERS
Following is a list of published
papers. You may obtain off-prints of these articles by contacting me at jonathan.lees@unc.edu.
To read Abstracts of these publications, click on
the Abstract link next to each title:
Johnson,
J.B., Lees, J.M., and Yepes,
H., 2006, Volcanoes, lightning, and a waterfall: Differentiating the menagerie
of infrasound in the Ecuadorian jungle: Geophysical Research Letters, v. 33,
L06308, doi:10.1029/2005GL025515.
Werner-Allen, G., Lorincz, K., Ruiz, M.C., Marcillo,
O., Johnson, J.B., Lees, J.M., and Welsh,
M., 2006, Deploying a wireless sensor network on an active volcano: IEEE
Internet Computing, Special Issue on Data Driven Applications in Sensor
Networks, v. 10, p. 18-25 doi:http://doi.ieeecomputersociety.org/10.1109/MIC.2006.26.
Click to see
Abstract
Tang, C., Rial, J.A., and Lees, J.M., 2005, Shear-wave splitting: A diagnostic tool to monitor fluid pressure in geothermal fields: Geophysical Research Letters, v. 32, p. L21317 doi:10.1029/2005GL023551. Click to see Abstract
Johnson, J.B., Ruiz, M.C., Lees, J.M., and Ramon, P., 2005, Poor scaling between elastic energy release and eruption intensity at Tungurahua Volcano, Ecuador: Geophysical Research Letters, v. 32 doi:10.1029/2005GL022847. Click to see Abstract
Ruiz, M, J. M. Lees, and J.
B. Johnson (2005), Source constraints of Tungurahua explosion events, Bulletin
of Volcanology doi:DOI 10.1007/s00445-005-0023-8
Click to see Abstract
Werner-Allen, G., J. Johnson, M. Ruiz, J. Lees, M. Welsh Monitoring Volcanic Eruptions with a Wireless Sensor Network. in Proc. Second European Workshop on Wireless Sensor Networks (EWSN'05 #1568945184). 2005. Click to see Abstract
Tang, C., Rial, J.A., Lees, J.M., and Thompson, E., 2005, Seismic Imaging of the geothermal field at Krafla, Iceland, Proceedings, Thirteenth Workshop on Geothermal Reservoir Engineering: Stanford University, Stanford, CA, p. SGP-TR-176. Click to see Abstract
Shalev, E., and J.M. Lees
(2004), Three dimensional tomographic analysis of the Loma Prieta
region, in USGS Professional Paper 1550-E: The Loma Prieta,
California, Earthquake of October 17, 1989 - Geologic Setting and Crustal
Structure, edited by R.E. Wells, pp. 127-142, U.S. Geological Survey,
Reston, VA. Click to see Abstract
Davaille, A., and J.M.
Lees, (2004) Thermal modeling of subducted plates: tear and hot spot at
the Kamchatka corner, Earth Planet. Sci. Letts.,
226 (3-4), 293-304, DOI: 10.1016/j.epsl.2004.07.024. Click to See Abstract
McGreger, A.D., and J.M. Lees,
Vent Discrimination At Stromboli Volcano, Italy, J. Volc. Geoth. Res., 137 (1-3), 169-185, DOI:
10.1016/j.jvolgeores.2004.05.007 2004. Click to See Abstract
Lees, J. M., Gordeev, E. I. & Ripepe, M. (2004) Explosions and periodic tremor
at Karymsky volcano, Kamchatka, Russia. Geophysical Journal
International 0 (0), -. doi: 10.1111/j.1365-246X.2004.02239.x Click to See Abstract
Lees, J.M., 2004. Scattering from a fault
interface in the Coso geothermal field. Journal
of Volcanology and Geothermal Research, 130(1-2): 61-75. Click to See Abstract
Ozerov, A., I. Ispolatov,
and J. Lees, Modeling Strombolian
eruptions of Karymsky volcano, Kamchatka, Russia, J.
Volc. Geoth. Res., 122 (3-4), 265-280, 2003. Click to See
Abstract
Levin, V., J. Park, M. Brandon, J.M. Lees, V. Peyton, E. Gordeev,
and A. Ozerov, Crust and upper mantle of Kamchatka
from teleseismic receiver functions, in Tectonophysics,
edited by I.M. Artemieva, H. Thybo,
W.D. Mooney, and E. Perchuc, pp. 233-265,
Elsevier, Amsterdam, 2002. Click
to See Abstract
Park, J., Levin, V., Brandon, M., Lees, J., Peyton, V., Gordeev,
E., and Ozerov, A., 2002, A dangling slab, amplified
arc volcanism, mantle flow and seismic anisotropy in the Kamchatka Plate
Corner, in Stein, S., and Freymuller, J.,
eds., Plate Boundary Zones, p. in press. Click to See Abstract
Johnson, J.B., R.C. Aster, M.C. Ruiz,
S.D. Malone, P.J. McChesney, J.M.
Lees, and P.R. Kyle, Interpretation and utility of infrasonic records
from erupting volcanoes, J. Volc. Geoth. Res., 121 (1-2), 15-63, 2003. Click to See Abstract
Lees, J.M., Three-Dimensional Anatomy of a Geothermal Field, in
Geologic Evolution of the Central Mojave Desert and Southern Basin and Range,
edited by A. Glazner, J.D. Walker, and J.M.
Bartley, pp. 259-276, Geological Society of America, Boulder, CO., 2002. Click
to See Abstract
Bhattacharyya, J., and J.M. Lees, Seismicity, stress and triggering in
the Coso/Indian Wells Valley region, in Geologic
Evolution of the Central Mojave Desert and Southern Basin and Range, edited
by A.G. J., D. Walker, and J.M. Bartley, pp. 243-258, Geological Society
of America, 2002. Click to See
Abstract
Yogodzinski, G.M., J.M. Lees,
T.G. Churikova, F. Dorendorf,
G. Woerner, and O.N. Volynets,
(2001): Geochemical evidence for the melting of subducting oceanic lithosphere
at plate edges, Nature, 409, 500-504.
Click to See Abstract
Lees, J. M., (1999) Geotouch: Software
for Three and Four-Dimensional GIS in the Earth Sciences, Computers & Geosciences26(7)
751-761. Click to see Abstract to see
full article: Full Article
Lees, J. M., M. Brandon, J. Park, V. Levin, A. Ozerov, E. Gordeev, (2001)
Kamchatka: Edge of the Plate, Iris News Letter, 2001(1), 17-19. ARTICLE: Side Edge of Kamchatka Slab
Peyton, V., V. Levin, J. Park, M. Brandon,
J. Lees, E. Gordeev,
and A. Ozerov (2001) Mantle Flow at a Slab Edge:
Seismic Anisotropy in the Kamchatka Region, Geophys.
Res. Letts. 28(2), 379-382. Click to see Abstract
Hough, H. E., J.
M. Lees and F. Monastero (1999)Attenuation and source properties at the Coso Geothermal Area, California, in press, Bull. Seismol.
Soc. Am. Click to see Abstract
Lees, J.
M. and H. Wu (2000), Poisson's
ratio and porosity at Coso Geothermal Area,
California, J. Volc. Geotherm. Res.
95(1-4), 157-173. Click to see Abstract
Johnson, J. B., and J. M. Lees (1999), Plugs and Chugs - Strombolian activity at Karymsky,
Russia, and Sangay, Ecuador, J. Volc. Geotherm. Res., 101, 67-82. Click to see
Abstract
Lees, J. M., and H. Wu, (1999), P-wave anisotropy, stress, and
crack distribution at Coso Geothermal Field,
California, J. Geophys. Res. 104(8),
17,955-17,973 Click to see Abstract
Moran, S. C., J.
M. Lees, and S. D. Malone,(1999) P wave crustal
velocity structure in the greater Mount Rainier area from local earthquake
tomography, J. Geophys. Res.104 (10),
10,775-10,786. Click to see Abstract
Wu, H., and J.
M. Lees, (1999) Three-dimensional P and S wave velocity structures of
the Coso Geothermal Area, California, from microseismic travel time data, J. Geophys.
Res. 104, 13,217-13,233, Click to
see Abstract
Bhattacharyya, J., S. Grosse, J. M. Lees and M. Hasting (1999): Recent
earthquake sequences at Coso: evidence for conjugate
faulting and stress loading near a geothermal field, Bull. Seismol.
Soc. Am. 89(3), 785-795 Click to
see Abstract
Wu, H., and J. M. Lees, (1999) Cartesian Parameterization of
Anisotropic traveltime tomography, Geophys. J. Int. 137(1) 64-80. Click to see
Abstract
Johnson, J., J. M. Lees and E. Gordeev
(1998), Degassing explosions at Karymsky Volcano,
Kamchatka, Russia, Geophys. Res. Lett. 25(21), 3999-4002. Click to see Abstract
Lees, J. M. (1998), Multiplet analysis
at Coso Geothermal,Bull. Seismol. Soc. Am. 88(5)
1127-1143. Click to see Abstract
Feng, Q., and J. M. Lees,
(1998) Microseismicity, Stress, and fracture within
the Coso geothermal Field, California. Tectonophysics, 289, 221-238. Click to see Abstract
Shalev, E., and J. M. Lees
(1998): Cubic B-Splines Tomography at Loma Prieta, Bull. Seismol. Soc. Am. 88(1), 256-269. Click to see Abstract
Wu, H., and J.
M. Lees (1997), Boundary Conditions on a Finite Grid: Applications with
Pseudo-spectral Wave Propagation, Geophysics, 62(5), 1544-1557 Click to see Abstract
Iversen, E. S., and J. M. Lees
(1996), A statistical technique for validating
velocity models, Bull. Seismol. Soc. Am. 86(6), 1853-1862 Click to see Abstract
Wu, H. and J. M. Lees (1996). Attenuation Structure of Coso
Geothermal Area, California, from P Wave Pulse Widths, Bull. Seismol.
Soc. Am., 86, 1574-1590 Click to see
Abstract
Lees, J. M. (1997). Waveform and spatial clustering in high
frequency seismograms: in Inverse Problems in Geophysical Applications,
Society for the Industrial Applications of Mathematics: 109-130 Click to see Abstract
Mann, M. E., and J. M. Lees (1996). Robust estimation of
background noise and signal detection in climatic time series, Climate
Change, 33, 409-445.
Lees, J. M. (1995). Xmap8: Three-dimensional
GIS for geology and geophysics, Seismological Research Letters:
66, 33-37.
Lees, J. M. (1995): Reshaping spectrum estimates by removing
periodic noise: application to seismic spectral ratios, Geophys.
Res. Lett., 22(4), 513-516. Click to see Abstract
Lees, J.
M. and J. Park (1995). Multiple-taper spectral analysis: A
stand-alone C-subroutine: Computers & Geosciences: 21,
199-236.
Ohmi, S. and J. M. Lees
(1995): Three-dimensional P and S-wave velocity structure below Unzen Volcano, J.
Volc. Geoth. Res., 65, 1-26.
Click to see Abstract
Lees, J. M. and G. T. Lindley (1994): Three-dimensional Attenuation
Tomography at Loma Prieta: Inverting t* for Q, J.
Geophys. Res., 99(B4), 6843-6863. Click to see Abstract
Ligdas, N. and J.
M. Lees (1993).
Seismic velocity constraints in the Thessaloniki and Chalkidiki areas (Northern Greece) from a 3-D tomographic
study: Tectonophysics: 228, 97-121. Click to see Abstract
Fischer, R. and J.
M. Lees (1993): Shortest path raytracing with
sparse graphs, Geophysics, 58(7), 987-996. Click to see Abstract
Lees, J. M. and C. Nicholson (1993): Three-dimensional tomography
of the 1992 Southern California sequence: Constraints on dynamic earthquake
ruptures?, Geology, 21(5), 385-480. Click to see Abstract
Lees, J. M. (1992): The magma system of Mount St. Helens:
Non-linear high resolution P-wave tomography, J. Volc.
Geoth.
Res., 53(1-4), 103-116. Click to see
Abstract
Lees, J. M. and E. Shalev (1992): On
the Stability of P-wave Tomography at Loma Prieta: A
Comparison of Parameterizations, Linear and Non-liner Inversions, Bull. Seismol.
Soc. Am., 82(4), 1821-1839. Click
to see Abstract
Lees, J. M. and M. Ukawa (1992): The
South Fossa Magna, Japan, Revealed by High Resolution
P and S-Wave Travel Time Tomography, Tectonophysics,
207, 377-396. Click to see Abstract
Nicholson, C. and J.
M. Lees (1992): Travel-time tomography in the northern Coachella Valley
using aftershocks of the 1986 ML 5.9 North Palm Springs earthquake, Geophys. Res. Lett.,
19(1), 1-4. Click to see Abstract
Lees, J. M. and R. S. Crosson (1991):
Bayesian ART versus conjugate gradient methods in tomographic seismic imaging:
An application at Mount St. Helens, Washington, in Spatial Statistics and
Imaging, editted by A. Possolo,
Inst. of Math. Statistics, 186-208.
Click to see Abstract
Lees, J. M. and J. C. Vandecar (1991):
Seismic tomography constrained by Bouguer gravity
anomalies: Applications in Western Washington, Pure Appl.
Geophys., 135(1), 31-52. Click to see Abstract
Lees, J. M. (1990): Tomographic P-wave velocity images of the
Loma Prieta earthquake asperity, Geophys.
Res. Lett., 17, 1433-1436. Click to see Abstract
Lees, J. M. and R. S. Crosson (1990):
Tomographic imaging of local earthquake delay times for 3-D velocity variation
in western Washington, J. Geophys. Res., 95(B4), 4763-4776. Click to see Abstract
Lees, J. M. and P. E. Malin (1990):
Tomographic images of P-Wave velocity variation at Parkfield,
California, J. Geophys. Res., 95(B13),
21793-21804. Click to see Abstract
Lees, J. M. and R. S. Crosson (1989):
Tomographic inversion for three-dimensional velocity structure at Mount St.
Helens using earthquake data, J. Geophys. Res., 94(B5), 5716-5728. Click to see Abstract
some other book marks