Workshop on the Seismogenic Zone at Trenches Snowbird, Utah March 16-21, 2003 Secular, Transient and Periodic Crustal Movements in Japanese Subduction.

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Presentation transcript:

Workshop on the Seismogenic Zone at Trenches Snowbird, Utah March 16-21, 2003 Secular, Transient and Periodic Crustal Movements in Japanese Subduction Zones, and Dynamics Underlying Them Kosuke Heki Division of Earth Rotation, National Astronomical Observatory, Japan

Contents Keyword: Crustal deformation, Japanese Islands, Earthquakes Secular crustal movement Tokai Earthquake Vertical movements, long- and short-term buying real estates in Japan Transient crustal movement Afterslip and silent earthquakes Where do they occur? a natural creepmeter Periodic crustal movement Seasonal change of surface loads Seasonality of seismicity radio astrometry What should we do next?

Basic mode of crustal deformation in an island arc (interseismic shortening/coseismic extension)

I was here In 1994 December, there was an earthquake

House Front yard North ! Surveyed in 1994 Summer Earthquake in 1994 December (M w ~ 8 including afterslip) My case …

Global Positioning System (GPS) ArrayDense

1998- Mt.Iwate volcano-seismic crisis 1995 Hyogoken-Nanbu coseismic + postseismic 1995,6,7,8 Seismic Swarm + Dike Injection time-dependent inversion Events that occurred 1994-now 1996 Boso Silent Eq Sanriku-Haruka-Oki year-long afterslip comparable to the main rupture 1994 Hokkaido-Toho-Oki coseismic jump + northward migration of the postseismic transient 1997 Kagoshima Eqs Yamaguchi 1996 Hyuganada Eq. sequence two earthquakes, afterslip + creep event Normal/slow earthquake Silent earthquake Magma activity 2000 Miyake-Kozu events Eruption, earthquakes, dike injection Tokai silent event Still in progress 2000 Tottori 2001 Geiyo Hirose et al., GRL, 26, 3237, 1999.

Events to occur (interplate) Tokai 197X Seismic gap at Suruga Trough Miyagi-Oki 201X An asperity at the Japan Trench Last rupture 1978 (80% probability in the next 20 yrs) Nankai, Tonankai 202X Interplate events at the Nankai Trough Last rupture 1946,1944 Normal/slow earthquake Silent earthquake Boso silent 2008 Similar events in 1983, 1990, 1996, 2002 Off-Aomori 20XX Last rupture 1968

T o k a i EU PH AM NA Izu microplate

Year (AD) A A B B C C D D E (Tokai region) E 20XX slower convergence rate longer recurrence interval ！

Secular movement Secular Transient periodic Vertical velocities available now

Taneichi Shizugawa Reference

Tide Gauge Combine horizontal and vertical velocities to estimate slip deficits (backslips)

Slip deficit (backslip) Savage [1983] = +

Everywhere is Coupled Along-strike Difference in Coupling Strength asperity Epicenter (stronger at asperities) Seismo zone genic Yamanaka and Kikuchi, 2001

Subsidence Uplift Neutral Uplift Subsidence Surface projection of down-dip edge max. uplift

Interseismic (backslip) Coseismic (forward slip) Averaged to zero ?? Slip deficit (backslip) model

Sanriku Coast North South Tanesashi Coast Kitayamazaki uplift subsidence

Transient movement Transient secular periodic

Slow Slips Silent Earthquake Afterslip X X

Interseismic (decades to centuries) Coseismic (seconds to minutes) afterslip Stable slide Fast rupture Postseismic (days to years) asperity locked

From Heki et al., 1997 Slip of asperity Slip of the region surrounding the asperity ?

Heki and Tamura, GPS Kuji

Heki and Tamura, Strainmeter

Large asperity (large interplate earthquake) Small asperity (characteristic small-earthquake sequences) = Natural Creepmeter Matsuzawa et al. (2002)

Characteristic small-earthquake sequence (= a small isolated asperity) Afterslip of 1994 Sanriku Eq Cumulative slip (cm) year After Igarashi et al. (2001) 1994 Dec.Sanriku Eq. Accelerated slip at depth

Hamamatsu w.r.t. OhgataSecular + Transient + PeriodicTransient + PeriodicTransient A Silent Earthquake

Dike intrusion (2000/Jun-Sep) Slow slip Mw  6.8 (2000/Sep- now) Tokai region

Nankai Trough 5 km 35 km 30 km 25 km 15 km 100% 25% 75% 1997 Bungo-Channel Silent Eq. Mw~ Fall - Now Tokai Silent Eq. Mw=~6.8 at Hyuganada 1996 Oct.19 Mw~6.7 Hyuganada 1996 Dec. 3 Mw~6.7 Relationship with rupture updip

Periodic movement periodic secular transient

Tateyama (late April)

Earth Subsidence extension contractionLoad Earth’s response to a surface load

Gojoume Naruko Tobishima Shizukuishi Onagawa Yamada Snow belt Contraction in winter Extension in winter Subsidence in winter

Estimated snow depth (density 0.4 g/cm 3 )

atmosphere Soil moisture All cause contraction in winter Seasonal Change of Surface Loads snow Sea surface height (0-10kPa) whole (0-10kPa) (100kPa) 1-2 kPa (100kPa) (5kPa) 1-2 kPa (5kPa) (0-1GPa) 1-2 kPa (0-1GPa)

AMeDAS snow depth meter The Snow AMeDAS average max. snow depth Snow density: 0.4 g/cm 3 Underestimated

The Atmosphere Winter value w.r.t. summer value 1kPa = 10 cm water

The Soil Moisture Winter value w.r.t. summer value Calculated using (1) potential evapotranspiration (2) precipitation

The Ocean negative positive after Sato et al., PEPI, 123, 45-63, 2001

fixed x 2 atmosphere snow ocean soil moisture

Tobishima-Naruko Kamitsushima-Susaki

Why do we care ? periodic secular transient It masks transient/secular signals It may influence seismicity Hamamatsu w.r.t. Ohgata

….. When crustal strain gradually accumulates and reaches a critical condition, relevant secondary factors, such as atmospheric pressure change, would surely induce an earthquake. Hence, at one hand measuring crustal strain, and investigating major secondary factors at other hand, it seems to me possible to forecast earthquakes. How far would this expectation realistic? ….. from “Modern Science”, 1916 March (in Japanese) by T. Terada (Physicist, founder of the Earthquake Research Inst., Univ. Tokyo.)

Seasonal variation of earthquake occurrence 8 12 M > 7.9 [Ohtake & Nakahara, 1999] High offshore seismicity in autumn/winter M > 7.0 [Okada, 1982] High seismicity in snow-covered area in spring/summer

time Stress drop (~1MPa) Recurrence interval (~100 yr) Stress build-up (~30 Pa/day or ~10 kPa/yr) Critical stress Stress Probability of earthquake occurrence  Stress rate

Snow Load Clamps Faults NE Japan ~ Reverse Central Japan ~ Strike-slip

Triggering of Earthquakes  n CFF = shear stress (positive in the direction of fault slip) t  normal stress (positive for unclamping) t  friction coeff. (0.2 ~0.5) Coulomb Failure Function 10 kPa/yr ± 3 kPa 0.3

P 0 : background seismicity P m : time-varying seismicity Expected Seasonal Variation of Seismicity P m   3/5 P 0

Snow depth and Inland earthquake epicenters More eq. in spring/summer in snowy area Little seasonality in snow-free area snowy not snowy

Does not pass the Schuster’s statistical test Correlation ambiguous for smaller earthquakes Opposite to ocean tidal case: correlation more significant for smaller earthquakes (Tanaka et al., JGR, 2002) Due to small number of earthquakes Global Mode of Seasonal Crustal Deformation A speculation: larger/smaller earthquakes may respond only to longer-/shorter- term disturbances However

Blewitt et al., A New Global Mode of Earth Deformation: Seasonal Cycle Detected, Science, 294, 2342, Degree 1 deformation Load Seasonal Mass Redistribution (snow, groundwater, atmosphere, etc.) Load Geocenter variation

Global Mode of Secular Crustal Deformation

J 2 > 0 (Spin) Cox & Chao, Science, 2002 Dickey et al., Science, 2002 Ocean 、 Glacior, CMB ?? J 2 < 0 (PGR). J 2 > 0 (1997-).. Change in the Earth’s Oblateness (J 2 )

Secular Transient Periodic seasonal tidal seismic Temporal aspects Spatial aspects Local Regional Global Plate motion Interseismic Degree 2 (J 2 ) Geocenter variation Degree 2 (C 22 ) Snow/atom. /hydro. loading PGR Ocean loading Pole tide Background free oscillation GPS seismometer (dJ 2 /dt) Postseismic (aseismic) Crustal Movements -1970’s Geodetic Survey Tide gauge Strainmeter 1980’s VLBI, SLR 1990’s GPS, inSAR SCG 2000’s GPS dense array SST Gravity Coseismic

Geodesy Proper Motion Astrometry (r.a., decl., distance) Astronomy Crustal Movement dX/dt dY/dt dZ/dt Positioning XYZ Beyond Global

National Astronomical Observatory Dark matter

Satellite Laser RangingVery Long Baseline Interferometry Two big brothers of GPS

V E R A VLBI Exploration of Radio Astrometry Angular resolution 0.01 mas Separation 2 A.U. Ranging with annual parallax Differential VLBI with dual-beam

Ranging with error of 10 % Galactic centerWe are here Already ranged by Hipparchus Our Galaxy Mizusawa Astrogeodynamics Observatory Synergy of Geophysics and Astronomy mm accuracy of annual crustal movement models needed

What should we do next ?

What should we do next ? Seafloor geodesy (Positioning, strain, etc.) Secular vertical velocity Wait and see matter of time Deploy the denser the array, the less ambiguous the interpretation

2001 Aug.14 M6.2 (depth 38km) A B B position w.r.t. A 2002 Oct.14 M5.9 (depth 53km) Asperity (last rupture 1968) Asperity (ruptured 1968, 1994) 1994 afterslip

Thank you for your attention References Blewitt et al., Science, Cox and Chao, Science, Dickey, et al., Science, Heki, Science, 2001 (reprints available) Heki, Earth Planet. Sci. Lett., Heki and Miyazaki, Geophys. Res. Lett., 2001 (reprints available) Heki, Miyazaki and Tsuji, Nature, Heki and Tamura, Geophys. Res. Lett., Hirose, et al., Geophys. Res. Lett., Igarashi et al., SEISMO, Matsuzawa et al., Geophys. Res. Lett., Miyazaki and Heki, J. Geophys. Res., Ozawa et al., Science, Sato et al., Phys. Earth Planet. Inter., Savage, J. Geophys. Res., Tanaka et al., J. Geophys. Res., Yamanaka and Kikuchi, 2001.