Raisbeck G.M. left cracks distinctly expressed in the relief of the . By continuing to use our website, you are agreeing to our, Fault Activation in Central Mongolia during the Holocene: Results of Study of the Mogod Earthquake Ruptures, Segmentation and termination of the surface rupture zone produced by the 1932 Ms 7.6 Changma earthquake: New insights into the slip partitioning of the eastern Altyn Tagh fault system, Kinematics of shallow backthrusts in the Seattle fault zone, Washington State, Seismic crustal deformation in the Southern Apennines (Italy), Assessment of seismically induced damage using LIDAR: The ancient city of Pnara (SW Turkey) as a case study, Late Quaternary slip rates on the Sierra Madre fault zone and paleoseismic evidence on the size and frequency of past ruptures, Using in situproduced 10 Be to quantify active tectonics in the Gurvan Bogd mountain range (Gobi-Altay, Mongolia), Fault systems of the eastern Indonesian triple junction: Evaluation of Quaternary activity and implications for seismic hazards, Copyright 2023 Seismological Society of America. Starting at 22 s after the nucleation, it improves the P, SH and SV waveforms. The segments activated during the Bolnay earthquake are clearly visible on the satellite images, whereas those of the Tsetserleg event are more difficult to identify (Okal 1977). In both cases, a subvertical fault is needed to explain the observed horizontal slip on the south segment. Then the seismogenic zone could be also thick, probably around 2030 km. TY - JOUR. E-mail: Search for other works by this author on: Magnitudes of large shallow earthquakes from 1904 to 1980, One century of seismicity in mongolia (19002000), Seismotectonic observations in the region of the north Hangay earthquake of 1905 (MPR) (in Russian), in Questions of seismotectonics of pre-Bakal and adjacent territories, Un problme inverse en microtectonique cassante, Ruptures of Major Earthquakes and Active Deformation in Mongolia and its Surroundings, Seismic images of continental lithosphere, Studying earthquake ground motion in Prague from Wiechert seismograph records, GPS measurements of crustal deformation in the Baikal-Mongolia area (19942002): Implications for current kinematics of Asia, A brief update on the focal depths of intracontinental earthquakes and their correlations with heat flow and tectonic age, Focal depths of intracontinental and intraplate earthquakes and their implications for the thermal and mechanical properties of the lithosphere, Digitization noise and accelerograph pen offset associated with Japanese accelerograms, A reappraisal of the 1950 (Mw 6.9) Mondy earthquake, Siberia, and its relationship to the strain pattern at the south-western end of the Baikal rift zone, Evidence for a seismogenic upper mantle and lower crust in the Baikal Rift, Depth distribution of earthquakes in the Baikal rift system and its implications for the rheology of the lithosphere, Multidisciplinary projects to look back on the roots of seismology, Actes de les V Trobades d'Historia de la Cincia de la Tcnica, Comment on The July 9 and 23, 1905, Mongolian earthquakes: a surface wave investigation by Emile Okal, Electromagnetic constraints on strike-slip geometryThe Fraser River fault system, Earthquakes and the Bases of the Seismic Zoning of Mongolia, The Joint SovietMongolian Scientific Reasearch Geological Expedition. A local stress tensor in the Tsetserleg area is proposed from surface ruptures. Therefore, we only compared the synthetic to the recorded ones (direct problem). (1992) and McBride (1995) observed from seismic profiles that strike-slip faults can cut the Moho. The variation in amplitude, due to the observed b shift (maximum 33 mm), is less than 1 per cent for an arm length of 450 mm. 106.2 km from The parameters of the solutions for the Tsetserleg earthquake (1905 July 9). (79.2 miles), 2011-12-27 15:21:56 UTC at 01:03 October 01, 2003 UTC, Location: 176.2 km from These observations suggest that the displacement produced during the penultimate event was similar to the 1905 slip. This strategy is important as the result of the inversion depend strongly on the initial value of the parameters. Laojunmiao Central Mongolia. The most probable models suggested are pure strike-slip, striking N280E, dipping north 50 to 90 . Lassere C.. Scholz C.H. In the case of western Mongolia the crust is thick (50 5 km; Villaseor et al. 1985). In 1905, two M ~ 8 continental strike-slip earthquakes occurred along the Bulnay fault system, in the northwestern part of Mongolia. Here, using sub-metric optical satellite images . Saryg-Sep The Tsetserleg earthquake was followed two weeks later by the Bolnai earthquake, and is considered a part of the same general crustal movement. Now at AixMarseille Unisit, CNRSIRDCollge de France, CEREGE UMR 34, BP80 13545 Aix en Provence, France; rizza@cerege.fr. at 19:29 August 25, 1922 UTC, Location: 2). The P projection on the NSEW plane and the emergence angle, allowed us to deduce the P waveform. Please check your email address / username and password and try again. Table 1 shows the station characteristics. lgiy Epicenter at 47.869, 85.076 Then, the two predicted values are averaged with weights given by the corresponding standard deviations. Gileva N.
10.2 km from Der Kniglichen Gesellschaft der Wissenschaften zu Gttingen. 8b). Therefore, we allowed a freedom on the parameter rupture depth from 20 to 100 km. b values chosen for the geometrical correction of the data. The maximum uncertainty induces a time error of 0.5 s at an amplitude of 30 mm. Latest earthquakes in Mongolia: list & interactive map Updated: Feb 4, 2023 14:56 GMT - 1 day 6 hours ago refresh Felt a quake? After scanning the records at high resolution, the original trace was precisely redrawn by using Adobe Illustrator. Franceschi D.. Prentice C.S. Search for other works by this author on: Centre Europen de Recherche et dEnseignement de Gosciences de lEnvironnement 7330, Mongolian University of Science and Technology. 11). 8c). Klinger Y.
at 19:30 July 04, 1974 UTC, Location: The Tsetserleg earthquake is believed to be a strike-slip rupture of a branch of the Bolnai Fault, extending about 190km. Epicenter at 48.168, 103.036 Subsequent research, mainly in modern times after World War II, identified a series of earthquakes subsequent to the 1905 quake. 47.2 km from (66.2 miles), 1957-12-04 03:37:53 UTC The natural period, partially adjustable, varies between 9 and 15 s. The damping, by forced air circulation between a cylinder and a piston, is about = 4 1. These observations suggest that the displacement produced during the penultimate event was similar to the 1905 slip. 127.2 km from Secure .gov websites use HTTPS This step must be done precisely before any further analysis of the body waveform. You could not be signed in. The first part of the paper concerns the instrumental corrections. Altay With the 7.8-magnitude earthquake hitting Turkey this Monday. The total rupture length for the Tsetserleg earthquake may reach up to 190 km, in order to explain the width of the recorded body waves. The 30 s delay between nucleation and the beginning of the added rupture, is in agreement with the change of the polarization of the S wave (Fig. Tosontsengel (2003). at 19:13 April 07, 1958 UTC, Location: The northern 80 km correspond to a reverse left lateral fault oriented N 60 10, with a dip of 65 10 to the NW, and a slip angle of 40 20. (1993). In this paper, we will invert body waves using the available 1905 seismograms. In practice, the equilibrium position of the needle arm may not be perpendicular to the driving cylinder axis. Cadek (1987) gives a procedure for transforming the (xi, yi) coordinates into time and amplitude. Belichenko B.G. Other arrivals during this period (PKiKP/pPKiKP/sPKiKP) have almost vertical emergence angles, and are quite invisible on the two horizontal components. On the other hand, the synthetic seismograms have been convoluted with the transfer function of each instrument, before comparison with the observed records. The cylinder and the paper are laterally displaced at a rate of 4.5 mm hr1 thus producing a helicoidally trace. at 02:49 February 13, 1933 UTC, Location: at 18:52 September 27, 2003 UTC, Location: The Bolnay earthquake, 14 days later, starts at the intersection between the main fault (left lateral strike-slip) and the Teregtiin fault (right lateral strike-slip). (90.2 miles), 1967-01-05 00:14:41 UTC N2 - Synthetic Love wave seismograms for a series of reasonable models of the catastrophic earthquakes of July 1905 in Mongolia are generated and compared to observed data, to help constrain the source parameters suggested from older field reports. Spakman W.
The Bulnay earthquake of 23 July 1905 (M w 8.3-8.5), in northcentral Mongolia, is one of the world's largest recorded intracontinental earthquakes and one of four great earthquakes that occurred in the region during the twentieth century.The 375 km long surface rupture of the leftlateral, strikeslip, N095Etrending Bulnay fault associated with this earthquake is remarkable for . De Simoni B.
Lukhnev A.
In 1905, two major earthquakes with magnitude M >7:5 occurred in the northern part of the Hangay massif (Fig. (2003) estimated a left lateral slip rate of 2.6 1 mm yr1 on the Bolnay fault, using GPS measurements (from 1994 to 2002), giving a return period of 4500 1750 yr. Influence of the Teregtiin segments on the modelled S-waveforms for the Bolnay earthquake. Baiyin All selected instruments were Wiechert seismographs with a mass of 1000 kg (Wiechert 1903, 1904). The recent evolution of methods and tools allow us to extract more information from the 1905 seismograms: Is the Tsetserleg segment associated to the July 9 event? Demjanovich MG, Borisov BA, Vashchilov YY (1995) Deformation and faulting at large earthquakes in Mongolia-Siberian region. Particular thanks are due to the staff of Jena, Gttingen, Uppsala and Strasbourg stations. Report it! Everyone thought that, Margaret Mitchell once said: Death, taxes, and childbirth! Does the Great Glen fault really disrupt Moho and upper mantle structure? The Bolnai earthquake is believed to be a strike-slip rupture of a branch of the Bolnai Fault, extending about 300[3] to 375[4] km along the fault, and possibly an additional 80km of the Teregtiin Fault. 1985), (Fig. Engdahl E.R. The added northeast segment should be associated with 7 m of left lateral strike-slip. You can help Wikipedia by expanding it. In the case of P waves, we obtained the signal only at Uppsala. (137.2 miles), 2021-01-11 21:32:58 UTC The 1905 Bolnai earthquake occurred in or near the Asgat Sum of Zavkhan Province in Mongolia on 23 July. If the result of the inversion gives, for one parameter, values inconsistent with field information, we fixed them to stabilize the solution. 1985)] which is one of the largest known events within a continental region. Dezember 1905. at 18:44 April 04, 1950 UTC, Location: Therefore, we use all available information (observed surface ruptures, main regional tectonic features, crust and lithosphere structure, etc.) An extension of the ruptures to the SW would imply that part of the Bolnay main fault broke, in contradiction with the previous wave modelling. All of the information we now have about the 1905 event came from one Russian seismologist who traveled to the area of the earthquake at his own expense, in 1905, and by primitive means of transportation. It has been associated to the 1905 July 23 earthquake because the scarp was fresh, and no other large event has been observed since. Recorded seismicity in the BolnayTsetserleg region. Kyren 47.2 km from DeLaurier J.M. The fault segment at Tsetserleg touches the one that ruptured during the Bolnay event, 14 days later. Bulgan Geologists have concluded that, in this poorly understood region, events like these appeared in cycles over geological time with recurrence rates of several thousands of years. Background [ edit] The total depth of the Bolnay rupture must be equal or larger than the nucleation depth. It was discovered only in 1958 by V. A. Aprodov & O. Namnandorg (Aprodov 1960) and studied in detail by Khil'ko et al. Vetterling W.T. We compared the final signal of the different stations, and we observed a good correlation of the results even though the data were corrected separately. M. Rizza, J.F. On the other hand, there were no Wiechert vertical components before 1906. The surface ruptures show almost pure left lateral strike-slip with displacements between 8 2 and 11 2 m (Khil'ko et al. Dverchre J.. Delouis B.
A .gov website belongs to an official government organization in the United States. 10a). Historical seismograms recorded by Wiechert instruments are digitized and corrected for the geometrical deformation due to the recording system. If we fix the depth to moderate value, the waveforms are explained (Table 3a). 1). 1993) seems underestimated in a region where the crust is thickened. Epicenter at 51.639, 101.134 Khovd San'kov V.. Dverchre J.
Boerner D.E. at 16:35 December 17, 1938 UTC, Location: Dverchre J.
By doing this, we obtained good results on most parts of the signal (Fig. Antoine Schlupp, Armando Cisternas, Source history of the 1905 great Mongolian earthquakes (Tsetserleg, Bolnay), Geophysical Journal International, Volume 169, Issue 3, June 2007, Pages 11151131, https://doi.org/10.1111/j.1365-246X.2007.03323.x. The solutions for the geometrical correction of the Teregtiin segments on the NSEW plane and the paper are displaced., allowed us to deduce the P, SH and SV waveforms Gesellschaft Der Wissenschaften zu Gttingen 50 90! This, we only compared the synthetic to the 1905 slip and corrected the... Your email address / username and password and try again trace was precisely redrawn by using Adobe Illustrator amplitude 30. M of left lateral strike-slip of western Mongolia the crust is thick ( 50 5 ;... Pure left lateral strike-slip will invert body waves using the available 1905 seismograms area is proposed from ruptures! 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