Active tectonics and geomorphology of the Kamchatsky Bay coast in Kamchatka
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Kamchatsky Bay is the northernmost bay at the Pacific Kamchatka coast. It is located at the junction between the Kamchatka segment of the Pacific subduction zone and the dextral transform fault of the western Aleutians. The combination of the subduction and collision processes in this region results in the unique set of tectonic controls influencing its geological and geomorphological evolution.
The Kamchatka River estuarine area is located on the northern coast of Kamchatsky Bay. The modern Kamchatka River valley, its estuary, and an aggradation marine terrace some 30 km long and up to 5 km wide were formed in this area during the Holocene. A vast area in the rear part of the terrace and in the Stolbovskaya lowlands is now occupied by the peats deposited directly above lacustrine-lagoonal and fluvial facies. These aggradational landforms record traces of tsunamis and vertical coseismic deformations associated with great subduction earthquakes, as well as strike-slip and thrust faulting associated with the collision.
The results indicate that the average recurrence interval for major tsunamis in the Kamchatsky Bay is 300 years. The recurrence interval on individual fault zones associated with the collision between the western Aleutian and Kamchatka arcs is a few thousand years for earthquakes of magnitude between 7 and 7.5. For the entire region, the recurrence interval for major crustal earthquakes associated with motions along faults may be equal to a few hundred years, which is comparable with that for subduction-zone earthquakes.
Keywordssubduction arccollision active fault tsunami Holocene Kamchatka River’s lower reaches marine terrace Kamchatsky Bay
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- 1.A. A. Godzikovskaya, Catalogue of Macroseismic Descriptions of the Kamchatka Earthquakes during Pre-Instrumental Observation Period (18–19 centuries) (GS RAN, Obninsk, 2009) [in Russian].Google Scholar
- 2.E. I. Gordeev, A. A. Gusev, V. I. Levina, et al., “Crustal seismicity of Kamchatka,” in Complex Seismological and Geophysical Studies. A Collection of Papers on 25th Anniversary of the Kamchatka Experimental-Methodical Seismological Party, GS RAN, Ed. by E. I. Gordeev and V. N. Chebrov (Petropavlovsk-Kamchatskii, 2004) [in Russian].Google Scholar
- 3.State Geological Map. 1: 200 000. Kamchatskaya PSE, Ed. by M. E. Boyarinova (Moscow, 1999) [in Russian].Google Scholar
- 4.A. A. Gusev, “Strong earthquakes of Kamchatka: location of focus during the instrumental period,” Vulkanol. Seismol., No. 3, 39–42 (2006).Google Scholar
- 5.V. A. Ermakov, E. E. Milanovskii, and A. A. Tarakanovskii, “Significance of rifting in the formation of Quaternary volcanic zones of Kamchatka,” Vestn. Mosk. Gos. Univ., No. 3, 3–20 (1974).Google Scholar
- 6.Yu. Ya. Zayakin and A. A. Luchinina, Catalogue of tsunami on Kamchatka (VNIIGMIMTsD, Obninsk, 1987) [in Russian].Google Scholar
- 7.A. I. Kozhurin, V. V. Ponomareva, and T. K. Pinegina, “Active fault tectonics of the southern central Kamchatka,” Vestn. KRAUNTs. Nauki O Zemle, No. 2, 10–27 (2008).Google Scholar
- 8.A. I. Kozhurin and T. K. Pinegina, “Active fault tectonics of teh Kamchatsky Peninsula as,amofestation of the collision between the Kamchatka and Aleutian island arcs,” in Problems of seismotectonics: Proceedings of 16th International Conference, Moscow, Russia, 2011 (Moscow, 2011), pp. 260–263 [in Russian].Google Scholar
- 9.M. M. Pevzner, V. V. Ponomareva, and I. V. Melekestsev, “Chernyi Yar-the reference section of the Holocene ash markers in the northeastern Kamchtaka coast,” Vulkanol. Seismol., No. 4, 3–18 (1997).Google Scholar
- 10.T. K. Pinegina, L. I. Bazanova, I. V. Melekestsev, et al., “Prehistoric tsunami on the Kronotsky Bay coast, Kamchatka, Russia,” Volcanol. Seismol., No. 2, 66–74 (2000).Google Scholar
- 11.T. K. Pinegina, E. A. Kravchunovskaya, A. V. Lander, et al., “Holocene vertical movements of the Kamchatsky Peninsula Coast from marine terrace data,” Vestn. KRAUNTs. Nauki O Zemle, No. 1, 100–116 (2010).Google Scholar
- 12.T. K. Pinegina, A. I. Kozhurin, and V. V. Ponomareva, “Estimate of seismic and tsunami hazard for the Ust’-Kamchatsk settlement (Kamchatka): evidence from paleoseismological data,” Vestn. KRAUNTs. Nauki o Zemle, 19(1), 138–159 (2012).Google Scholar
- 13.N. I. Seliverstov, Structure of the Near-Kamchatka Sea Bottom and Geodynamics of the Kuril-Kamchatka-Aleutian Junction Zone (Nauch. mir, Moscow, 1998) [in Russian].Google Scholar
- 14.N. I. Seliverstov, Geodynamics of Junction Zone of the Kuril-Kamchatka and Aleutian Island Arcs (KamGU im. Vitusa Beringa, Petropavlovsk-Kamchatskii, 2009) [in Russian].Google Scholar
- 17.J. Bourgeois and T. Pinegina, “Reconstructing the tsunamigemc earthquakes on the northern Kamchatka subduction zone: the 1997 Kronotsky earthquake and tsunamic and their predecessors,” in 7-th Biennial Workshop on Japan-Kamchatka-Alaska Subduction Processes: Mitigating Risk through International Volcano, Earthquake, and Tsunami Science (JKASP-2011), Petropavlovsk-Kamchatsky, Russia, 2011 (IViS FEB RAS, Petropavlovsk-Kamchatsky, 2011), P. 197–198.Google Scholar
- 19.SAPB 6.0 program and documentation: http://calib.qub.ac.uk/cahb.
- 21.B. C. Douglas, M. S. Kearney, and S. P. Teatherman, Sea Level Rise: History and Consequences (Acad. Press, San Diego, 2001).Google Scholar
- 22.R. Freitag, C. Gaedicke, B. Baranov, et al., “Collisional processes at the junction of the Aleutian-Kamchatka arcs: new evidence from fission track analysis and field observations,” Terra Nova, No. 13, 433–142 (2001).Google Scholar
- 25.A. Gorbatov, V. Kostoglodov, and G. Suarez, “Seismicity and structure of the Kamchatka subduction zone,” J. Geophys. Res. 102, 898 (1997).Google Scholar
- 26.Global CMT catalog: http://www.globalcmt.org/CMTsearch.html
- 28.A. I. Kozhurin, “Active faulting in the Kamchatsky Peninsula, Kamchatka-Aleutian Junction,” in Volcanism and Subduction: The Kamchatka Region, Ed. by J. Eichelberger, E. Gordeev, M. Kasahara, et al., Amer. Geophys. Union, Geophys. Monogr. Ser. 172, 263–282 (2007).Google Scholar
- 29.A. I. Kozhurin, “A Dangling slab and arc-normal extension: the case of Kamchatka, Russia,” in Amer. Geophys. Union, Fall Meeting, San Francisco, US, 2009 (San Francisco, 2009).Google Scholar
- 30.J. P. McCalpin, Paleoseismology (Academic, London, 2009), Int. Geophys. Ser 95 (2009).Google Scholar
- 31.B. C. Papazachos, E. M. Scordilis, D. G. Panagiotopoulos, et al., “Global Relations Between Seismic Fault Parameters and Moment Magnitude of Earthquakes,” Bull. Geol. Soc. Greece 36, 1482–1489 (2004).Google Scholar
- 32.J. Park, V. Levin, M. Brandon, et al., “A Dangling slab, amplified arc volcanism, mantle flow and seismic anisotropy in the Kamchatka plate corner,” in Plate Boundary Zones, Ed. by S. Stein and J. Freymuller (Am. Geophys. Union. Washington, 2002), Geodynam. Ser., 30, 295–324 (2002).Google Scholar
- 36.M. Stuiver and P. J. Reimer, “Extended 14C database and revised CALIB radiocarbon calibration program,” Radiocarbon 35, 215–230 (1993).Google Scholar
- 37.D. L. Wells and K. J. Coppersmith, “New empirical relationships among magnitude, rupture length, rupture width, rupture area, and surface displacement,” Seismol. Soc. Am., Bull. 84(4), 974–1002 (1994).Google Scholar
- 38.Worldwide Tsunami Database, 2000 B.C. to present. Boulder, Colorado, NOAA/NGDC. http://www.ngdc.noaa.gov/seg/hazard/tsudb.html)