Earth’s tidal tilt jumps and their relationship to earthquake source’s physics

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Бібліографічні деталі
Дата:	2010
Автори:	Shliakhovyi, V., Chernyi, V.
Формат:	Стаття
Мова:	English
Опубліковано:	Інститут геофізики ім. С.I. Субботіна НАН України 2010
Назва видання:	Геофизический журнал
Онлайн доступ:	http://dspace.nbuv.gov.ua/handle/123456789/103081
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Назва журналу:	Digital Library of Periodicals of National Academy of Sciences of Ukraine
Цитувати:	Earth’s tidal tilt jumps and their relationship to earthquake source’s physics / V. Shliakhovyi, V. Chernyi, V. Shliakhovyi // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 146-149. — Бібліогр.: 5 назв. — англ.

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Digital Library of Periodicals of National Academy of Sciences of Ukraine

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spelling	irk-123456789-1030812016-06-14T03:03:31Z Earth’s tidal tilt jumps and their relationship to earthquake source’s physics Shliakhovyi, V. Chernyi, V. Shliakhovyi, V. 2010 Article Earth’s tidal tilt jumps and their relationship to earthquake source’s physics / V. Shliakhovyi, V. Chernyi, V. Shliakhovyi // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 146-149. — Бібліогр.: 5 назв. — англ. 0203-3100 http://dspace.nbuv.gov.ua/handle/123456789/103081 en Геофизический журнал Інститут геофізики ім. С.I. Субботіна НАН України
institution	Digital Library of Periodicals of National Academy of Sciences of Ukraine
collection	DSpace DC
language	English
format	Article
author	Shliakhovyi, V. Chernyi, V. Shliakhovyi, V.
spellingShingle	Shliakhovyi, V. Chernyi, V. Shliakhovyi, V. Earth’s tidal tilt jumps and their relationship to earthquake source’s physics Геофизический журнал
author_facet	Shliakhovyi, V. Chernyi, V. Shliakhovyi, V.
author_sort	Shliakhovyi, V.
title	Earth’s tidal tilt jumps and their relationship to earthquake source’s physics
title_short	Earth’s tidal tilt jumps and their relationship to earthquake source’s physics
title_full	Earth’s tidal tilt jumps and their relationship to earthquake source’s physics
title_fullStr	Earth’s tidal tilt jumps and their relationship to earthquake source’s physics
title_full_unstemmed	Earth’s tidal tilt jumps and their relationship to earthquake source’s physics
title_sort	earth’s tidal tilt jumps and their relationship to earthquake source’s physics
publisher	Інститут геофізики ім. С.I. Субботіна НАН України
publishDate	2010
url	http://dspace.nbuv.gov.ua/handle/123456789/103081
citation_txt	Earth’s tidal tilt jumps and their relationship to earthquake source’s physics / V. Shliakhovyi, V. Chernyi, V. Shliakhovyi // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 146-149. — Бібліогр.: 5 назв. — англ.
series	Геофизический журнал
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first_indexed	2025-07-07T13:15:58Z
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fulltext	/#�)-(% '0%.�+,#(� #(%1 ��4 �� Earth’s tidal tilt jumps and their relationship to earthquake source’s physics V. Shliakhovyi1, V. Chernyi2, V. Shliakhovyi1, 2010 1Poltava Gravimetric Observatory of the Institute of Geophysics, National Academy of Sciences of Ukraine, Poltava, Ukraine �� Q �� 2eMeter Corporation, San Mateo, USA scherniy@yahoo.com Institute of Geology and Seismology and Polta- va Gravimetric Observatory of Institute of Geophy- sics of National Academy of Sciences of Moldova and Ukraine researched earth’s crust tilt deforma- Fig. 1. Usual record of earth- tidal tilts at station "Chisinau". Top — with presence of seasonal microseisms and bottom — without. �� !"#�$%&'�("�%()�#+#�' #(&"�&��&,#��-�%()� �)#..'(/ Fig. 2. The sample of earth-tidal tilts record with doubled Vranchea earthquakes and corresponding tilts jumps ("Chisinau"). Earthquakes parameters with corresponding tilt jumps �� !"� �#� �$� �#� �$� %#� �$� &� &'()')�&&+&,� '-� .')� -/',� &-(� -((� &')� &',� &0� )� .-� &1� -.)� /1� -� &'()')�&.+0� '� .'0� -/'-� &(� &1� '-� &'&� --� &(� 0)� ,� &/� 0&� 0� -,'(.')/�((+(.� '&� .'.)� -/'1� .&� -0� ('� (',� &-)� -� 0)� )� --1� )-� .� &/'()')/�(/+.&� '-� .'0� -/'.-� &.� -.� &'� '/� -10� -,� -1� &-� &.-� /&� � 0('()')/�-&+-)� ,'(� .'-� -/'.1� &0,� -� &/(� .1� 00(� -(� -0)� ,� &0&� /1� /� &/'&-')/�--+00� .')� .'1� -/'/� &.-� -0� -'.� -'.� -,-� 1� )� 0-� &/1� ,� ,� -0'(1'),�-(+.(� .'� .'/� -/'1� &.(� --(� &'.� (')� -,/� -/� &1� -� &./� -� )� )'(&'))�&/+(� .')� .'.� -/'-/� &0� -)� &-'0� &'� 0&&� (� --(� ,,� .&� &0� 1� 0('('1(�&(+.(� /'� .'),� -/'),� )1� -&� ./(� ,&(� 0&)� &,� &� 1� &/)� ,(� &(� 0&'('1(�((+&,� /'.� .')0� -/')1� ,1� -(� 2&((� &)(� -,� --� &-0� &� -..� /0� &&� -/'(/'1(�(,+.� .'0� .',� -/')� )-� -((� 2('.� (',� 1,� (� &),� � &� )� &-� &0'(&'1&�-0+.)� .'1� .',0� -/',� &-(� -&(� &'/� &� -(� &� -1(� )� &&� )-� &0� 0&'(&'1&�&0+-1� '&� .',-� -/'/1� &-,� &1� &'-� &'� -0� &/� &&� � --&� ,.� &.� -&'&&'1-�&-+� .')� .')� -/')� &-.� -&� &-')� ,� -/&� &)� 0-� � 11� ,&� � tion in the vicinity of earthquake source zone Vran- chea during 14 years. Auto-compensating tiltmeters allow to broaden the spectrum of the research, in- cluding earth-tidal study, recent movement of the earth’s crust, and geodynamic processes in area adjacent foci zone of Vranchea earthquakes — one the most active seismogenic regions in Europe. Observation station was located in the mine, about 75 m underground and maximally distant from the technogenic and climotogenic sources of noise. High quality of data allows use of observations in study of strong earthquakes precursors; three of these stronger earthquakes (M~6.4 7.0) occurred during observation period, which also allowed get- ting precious scientific results for whole spectrum of study areas. Some results of these studies were published [Schlikhovoi et al., 1989; 1997; 1998; Drumea et al., 1990], some — are still in progress. The study of jump events corresponding to strong earthquakes of Vranchea is important to study of their relation with regional geotectonic and to earth- quake precursor study. This aspect of study is im- perative due to the expected strong earthquake ac- cording to known seismic activity cycle of Vranchea /#�)-(% '0%.�+,#(� #(%1 ��2 �� region. Usually, the jumps are recorded for earth- quakes with R 4,5. During the period of observa- tion, 35 earthquakes of similar magnitude took place in Vranchea; five of which (R 4,8) are missing jumps, four — concealed with mine noise, data for twelve is missing due to equipment malfunction and blackouts. We ended up with 14 sets of high quali- ty jumps data displayed in Tab. 1 along with foci mechanism parameters. Examples of record of tid- al tilts at station "Kishinev" at usual registration and with jumps at earthquakes are shown Fig. 1, 2. Analysis of data in table shows that jumps accom- pany all R 5 earthquakes. Analysis shows that meaningful statistical relationship could be estab- lished between magnitudes of earthquakes (M) and amplitudes of jumps (Am). The dependency can be expressed by regression: R=(4.58±0.41)+(0.74± ±0.11) lg \|Am\| with 10 % accuracy. The values and sign of the jump components depend on position of the fault’s surface and azimuth line between obser- Fig. 3. Vector-diagram of tilt jumps. Fig. 4. Samples of tiltmetric records with the presence of technogenic tilt jumps originated by heavy traffic during the experiments: top — st. Sudievka and bottom — Dniester river bridge. �� 3 �� !"#�$%&'�("�%()�#*+#�' #(&"�&��&,#��-�%()� �)#..'(/ vation’s location and earthquake focus. Tilt jumps vector-diagrams display this (Fig. 3). In case of dou- bled earthquakes (with close time of occurrences) we have clearly identified jumps for each earthquake respectively. In case of weak earthquakes the jumps are mono-directed, for strong — multi-directed. Tilt jumps quantitative interpretation follows fault- dislo- cation model, which precisely depicts foci proces- ses. This approach allows determine earthquake geometrical and energetical parameters on the ba- sis of several observation stations. The method rep- resented in monograph "Earthquake mechanics" [Kasahara, 1981] was used to interpret observed data. Unfortunately, we only have one station data, thus can use only simple model (dip-slip). This model fits most of strong Vranchea earthquakes due to faults surface angle falling into 70 —85 and slips being vertical [Drumea et al., 1990]. Even for the simple model three stations observation are required. Assuming relation between magnitude and fault parameters (height, length), slip parameters were computed; the results of computation (except: May 1990 earthquakes) were in sync with the results derived by other methods [Drumea et al., 1990]. Jumps appeared on tidal tilt records aside from seis- mic events, and were considered as noise and ig- nored. Turns out, the jumps appeared as result of sudden overload of geophysical continuum. This was proven by real time sync tiltmetric observations in pit-hole at station Sudievka (Poltava suburb) and deformation study at Dniester river bridge (Bender). Records of these observations often contained peak impulses with residual tilts from 0,001 (in pit-hole) to 1 (bridge) arc.sec (Fig. 4). Some time these jumps were considered as instrumental noise, but then have established that they are caused by loadings from moving transport. Observations on the bridge delivered records of elastic and non-elastic tilt jumps; with lesser quantity and amplitude of jumps in areas where pillars were set in denser rocks. Most likely, tilt jumps are caused by non-elastic rock deformation. Moreover, tilt frequency and jump am- plitude indicate critical condition of rock deforma- tion. Based on the above-mentioned observations and results of the data analysis, we were able to arrive at following conclusions: a) tilt jumps occur at geo-objects of different scale and composition, yet display same physical nature; b) presence of jumps (deformations, slides) de- monstrates unstable condition of geo-objects; c) increase of amplitude and number of jumps indicates transformation of geo-object into more dynamic deformation phase that predeceases ca- tastrophes such earthquake, landslide, mine col- lapse, and other; and, possibly, may be considered as direct precursor of natural and technogenic ca- taclysm; d) tiltmetric observation are direct indicators of continuum deformational state, thus must be con- sidered as necessary component in complex geo- physical monitoring of deformational processes. References Drumea A. V., Shebalin N. V., Skladnev N. N. The Car- pathian Earthquake of 1986. — Chisinau: Stiinza, 1990. — 334 p. Kasahara K. Earthquake mechanics. — Cambridge University, 1981. — 260 p. Schlikhovoi V� ��Cherny V� I��Ostrovsky A� E��Investi- gation�of�deformation�processes� in�the�area�of�the Vrancea�focal�zone�using�precise�tiltmeters //��th �In. SymS. �Geodesy�and�Physics�of� the�Earth��Pots- dam�(GDR),�� .�III. Recent�Crustal�Movements. —�Potsdam�� . � P� �� Schlikhovoi V. �., Schlikhovoi V. �., Slusar E. G. Ju- mSs of the Tilts at Earthquakes of Vranchea // 29th Ge-neral Assemble Int. Association of Seismology and Physics of the Earth’s Interior, Abstract. (Thes- sa-loniki (Greece) August 18—28). — 1997. — P. 197. Schlikhovoi V. �� ., Cher- ny V. I. Results of a study of tidal tilts near to Vranchea zone // P�� !�S��on Earth Tides. (Brussels, July 22—25, 1997). — Brus- sels, 1998. — P. 243.

Earth’s tidal tilt jumps and their relationship to earthquake source’s physics

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