Latest earthquakes in Mongolia: list & interactive map Updated: Feb 7, 2023 15:20 GMT - 19 minutes ago refresh Felt a quake? Their observations were completed by Aprodov (1960), Khil'ko et al. Online Material: Table of 10Be concentrations with sampling information, highresolution stratigraphic and topographic maps, and 10Be analyses at various sites. (6.2 miles), 1974-07-04 19:30:42 UTC Revolutions happen, The two atomic bombings from Hiroshima and Nagasaki in August, America is no stranger to the devastating impact a political, Timeline: 1 May 1960: An American U-2 spy plane being, During World War I prices in Germany had doubled, but, The fiasco of the Afghan presidential election of 2009 is, On February 20th, President Vladimir Putin released a warning to the West over Ukraine, by, Do you know how to protect yourself in case of an earthquake? Western Mongolia. We could use only four stations (Jena, Gttingen, Uppsala and Strasbourg) because we selected the distance (30 to 90), the recording geometry (no circular recording as Ewing), damped seismometers (we did not use the Milne seismogram) and the largest possible azimuth distribution. Quintiliani M. It would be at least 40 km for Bolnay. Kurtz R.D. We have no specific information about the nucleation depth. The PcP arrives at more than 1 min for Gttingen and Jena and at more than 1.5 min for Uppsala after the P. Then, for signal duration of 150 s, the use of a unique emergence angle is acceptable for the 1905 July 9 and 23 events except for the end of the P wave which could be affected by PcP with another emergence angle. Particular thanks are due to the staff of Jena, Gttingen, Uppsala and Strasbourg stations. It also propagated 80 km to the southeast along the Teregtiin fault. 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. All observed data has been normalized, using geometric and physical attenuation, to an epicentral distance of 40, and then the instrumental amplification has been changed to 10 000. Adding this segment improves the SH and SV waveforms and gives higher amplitude on the P (Fig. Other arrivals during this period (PKiKP/pPKiKP/sPKiKP) have almost vertical emergence angles, and are quite invisible on the two horizontal components. Ritz J.F. (23.2 miles), 1927-05-22 22:32:49 UTC Epicenter at 43.099, 104.521 Spakman W. It implies about 2.4 m of displacement on the central segment and 2.6 m on the southwestern segment, in agreement with the 2.3 m considered by Baljinnyam et al. On the other hand, the synthetic seismograms have been convoluted with the transfer function of each instrument, before comparison with the observed records. If we fix the depth to moderate value, the waveforms are explained (Table 3a). 1987; Chen 1988; Dverchre et al. 8b). Yiou F. The Jena station was not inverted, but compared to the synthetic (weight of 0 in the inversion), as the beginning of the predicted signal was poorly constrained, and since the station was near Gttingen. U.S. geologists in particular saw similarities between the layout of fault lines in this part of Mongolia and the fault lines associated with the Venture and the San Andreas faults. Petit C. In 1905, two major earthquakes with magnitude M >7:5 occurred in the northern part of the Hangay massif (Fig. We modelled first the Bolnay earthquake taking into account only the main fault, that is subvertical and oriented between N95 at the west and N90 to the east. The 11 January 2021 Mw 6.7 Hovsgol, Mongolia, earthquake is the largest event that has occurred in the Hovsgol graben, which is noted for being the northernmost convergence region of the. 2003). 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. 1991, 2001; Bayasgalan 1999). 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. Signal envelope for the Tsetserleg and Bolnay 1905 earthquakes. lgiy The rupture propagation is mainly eastward. Epicenter at 45.189, 99.368 Epicenter at 47.869, 85.076 It is a reverse fault with a right lateral component, oriented N135 and dipping between 50 and 70 to the NE. As 1Hz is a reasonable sampling for the digitization of low speed mechanical seismograph recordings and as we do not need higher frequencies, we sampled down the data to 1 second after applying a low pass filter (Butterworth with two poles) anti-aliasing at 2 s. The impact of the low pass filter is negligible for our study, as the record is made at teleseismic distances, and the natural period of our instruments is large, between 10 and 14 s. In order to fill the gaps at the minute marks, we applied a linear predictive filter (Press et al. They were mapped a few months after the events (Voznesenskii & Dorogostaiskii 1914). 77.2 km from Wuwei Maintaining our website and our free apps does require, however, considerable time and resources. What are the focal depth, rupture length and width, or seismic moment? Delouis et al. [6], Lasting damage of the earthquake can be seen in the Mongolia special of the Amazon Prime motoring show The Grand Tour.[7]. They are either fixed or inverted at the end, when the general result is consistent with the field data. The value of the arm shift is not measured during the recording, and it must be deduced. Required fields are marked *. 2003). Amarjargal S. Comparison of the Bolnay S waveforms recorded at Jena, Uppsala and Gttingen after doing all corrections. The depth of the rupture was always free. Along the 80km stretch, between 97.18E and 98.33E, the fault zone is characterized by several meters width and the mean leftlateral 1905 offset is 8.90.6m with two measured cumulative offsets that are twice the 1905 slip. Beside the various parameters (azimuth, dip, slip on the fault, scalar seismic moment, depth of the nucleation, depth of the centrod of each segment, amplitudes of the source time function and relative position of the different segments. 1985; Baljinnyam et al. 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. This article related to the history of China is a stub. The parameters of the solutions for the Tsetserleg earthquake (1905 July 9). Usually it is restrained to the seismogenic layer. 80.2 km from You can help Wikipedia by expanding it. 1985; Ritz et al. 1; Khil'ko et al. Voznesenskii and Dorogostaiskii reached the region only 3 months after the earthquake, but they had enough information to say that the first event is associated to the Tsetserleg earthquake, and the second one to Bolnay. Indeed, Kosmos satellite images show 80 km of active faults at the NE of the mapped surface ruptures. Xu X. For 1 horizontal and oriented NS, the best shape factor R is 0 (2 = 3), meaning uniaxial compression (Armijo & Cisternas 1978). The Teregtiin segment must break first since numerous tests, placing it later in the history of the source, do not explain the beginning of SH and P waves. Three cases have been explored: (1) nucleation and rupture in the seismogenic layer; (2) nucleation in the seismogenic layer with rupture propagation down to the base of the crust and (3) nucleation at the interface between the crust and the upper mantle with rupture propagation under the crust. The case, in which both durations were equal, was rare. 2005). E. in der Zeit von 1. Note that, despite adding this new structure, the end of the S wave is not completely explained. In parallel, paleoseismological investigations show evidence for two earthquakes prior to the 1905 event with recurrence intervals of ~2700-4000 years. 1985). Two great Mongolian earthquakes, Tsetserleg and Bolnay, occurred on 1905 July 9 and 23. Materials from the department of Physical Geographical Society of the USSR, Map of the earthquakes of 9 and 23 July, 1905 (scale1/420 000) SPb, New empirical relationships among magnitude, rupture length, rupture width, rupture area, and surface displacement. (2003). Your email address will not be published. We tested three cases: (1) nucleation and rupture depth limited to the seismogenic zone; (2) nucleation in the seismogenic zone and rupture propagation going to the base of the crust and (3) nucleation within the crust-upper mantle interface and rupture propagation within the upper mantle. The nucleation of the Tsetserleg earthquake is, for our favoured but not unique solution, at the western extremity of the central segment oriented N60 and characterized by left lateral strike-slip with reverse component. Thus we favour the eastward propagation as proposed by Okal (1977). 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