RUSSIAN JOURNAL OF EARTH SCIENCES VOL. 10, ES5003, doi:10.2205/2007ES000268, 2008
[3] Foreshocks and aftershocks of the earthquakes occurred in the southwestern offsets of the Koryak Highland ranges that surround the Vyvenki River valley (description according to plane-table map of scale 1:500,000 "General Staff. Tilichiki'', R-58-V, G (1977) and "General Staff. Pakhachi'', R-59-V, G (1989).
[4] Distribution area of the earthquakes including their foreshocks and aftershocks forms a distinct rectangle extending from the Vetrovayam River in northeastward direction (50o) at 182 km to the Vakhavnitvayam River. The rectangle is slightly deformed being 74 km wide in the southwest and 66 km wide in the northeast. Its northern boundary begins from the Vetrovayam River (734 m a.s.l.) and passes along the major watershed of the highland to the Lyapganaivayam River (486 m a.s.l.). The northeastern boundary of the rectangle extends southeastward from the Lyapganaivayam River, through the Mt. Dvoinaya (1007 m a.s.l.) in the Vetvistaya River head to the point 345 m a.s.l. in the upper reaches of the Malyi Iyavyam River. The southern boundary of the rectangle stretches southwestward from the point 345 m a.s.l. through the Yavukuvayam River mouth (right tributary of the Pylgovayam River), approximately through Mts. Amva (689 m a.s.l.), Gainaluea (426 m a.s.l.), Olapail' (642 m a.s.l.) and terminates near the Village Olyutorka (the listed mounts are located about 3-5 km north of the boundary). The western boundary of the rectangle passes northwestward from the Olyutorka Village through the Village Korfovskaya MRS to the point 734 m a.s.l. nearby the Vetrovayam River head.
[5] The rectangle of the earthquake area is associated with three longitudinal orographic stripes.
The northwestern one is represented by the Iygtyla, Ivtyl'avachum, and Seinav-Tunup mountains;
south of the ranges occurs the Vyvenki River valley of width ranging from 20 km in the
southwestern portion to 5-7 km in the northeastern part; the southeastern stripe is formed by the
system of parallel ranges. These are the mounts Akhtynyn, Mamigai and the Ostantsovyi, Khai-Khokyn,
and Maini-Kokyin ranges that are separated by the Av'yavayam and Tyltovayam narrow
river valleys from the Ivtygin Range, the southernmost stripe of the Tilichin Ranges. The southern
ranges are broken in the central part, opposite to the Vyvenki River valley, by stream valleys of the
Egilvayam basin. The latters merge with the Vyvenki River valley widening it up to 32-35 km and
form a rectangular lowland 32-35
45 km in size.
[6] The rectangle of the Khailino and Olyutorka earthquakes swarm is distinctly subdivided into five equal areas of northwestern extension, according to the shock clusters. The southwesternmost area, 44 km wide, occurs between the Vetrovayam River and the Tapel'vayam River low reaches. Its eastern boundary is traced to the Kultushnaya River head and further in the Govena Peninsula to Mt. Ustanap (1157 m a.s.l.). In the northwest it is traced to Mt. Ekynynai (822 m a.s.l.). The center of the area is the Village Vetvei in the Vetvei River mouth (right tributary of the Vyvenki River). The Village Tilichiki occurs in the southwestern angle of the area, which is given the corresponding name.
[7] Next in northeastward direction area has the eastern boundary along the Ogiranvayam River head (1132 m a.s.l.), western shore of the Nayuyu-Gytkhyn Lake, and is traced to the southwestern shore of the Potat-Gytkhyn Lake in the Govena Peninsula. Its center is the Village Khailino. It is named the Khailino area.
[8] Northeast of the latter the third, Uvalistaya area with the Uvalistye Mts. in the center, is located. Back of it the Inochvivayam area occurs, which gets its name from the Inochivivayam River. Finally the fifth area is situated in the basins of the Ayaonyvayam, Vakhavnitvayam, Vocheivayam, and Vulvyyakuyul rivers and is named the Vulvyyakuyul area. It is characterized by a single aftershock.
Citation: 2008), Tectonic position of the Khailino and Olyutorka earthquakes, Russ. J. Earth Sci., 10, ES5003, doi:10.2205/2007ES000268.
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