Сейсмическая активность в Турции 6 февраля 2023 г. началась с двух сильных землетрясений магнитудой более 7,5, а далее, в области Восточно-Анатолийского разлома, на протяжении нескольких дней зарегистрировано большое количество событий магнитудой от 4 до 6. Впоследствии, в зоне землетрясений наблюдались разрывы земной поверхности, смещения, обвалы горных пород, оползни и опускания грунта. Измерения последствий землетрясения проводились различными геодезическими методами – от классического нивелирования до методов космической геодезии. Зарегистрированная протяженность сейсмического разрыва на земной поверхности составляла 300 км. Величина смещений по разрывам в эпицентре достигала 6 м. Поле смещений анализировалось в ближней и дальней зоне землетрясений. В ближней зоне применялось нивелирование, GPS-метод по локальной сети и метод спутниковой радарной съемки. Результаты измерений соответствуют модельным расчетам и сейсмологическим данным. В анализе смещений в дальней зоне использованы материалы измерений методом космической геодезии по данным международной сети IGS. Даже в 300 км от эпицентра смещения составляют 20 мм. Косейсмические деформации в дальней зоне достигают 10-8, что на порядок выше фоновых значений 10-9. Результаты пространственного распределения скорости смещений в дальней зоне показали сложную картину, что может быть следствием конфигурации разломной сети и положением станций измерений. Косейсмические горизонтальные смещения и опускания земной поверхности вызвали наводнения в районах Турции, расположенных к юго-западу от эпицентров землетрясений 6 февраля 2023 г. Проведено исследование смещений и деформации территории Турции и её окружения в эпохи с 2017 по 2023 г. Выделено затухание смещений за два года до сейсмической активизации 2023 г.

Tidal corrections for gravity and geodesy observation are important for monitoring study. South Siberia and Far East observation is part of world tidal network. There tidal result agrees with static theory and it had weak ocean dynamical influence. Results change near coast, where observation at Khabarovsk and Sakhalin stations, are complete long-term observation at Poisiet level station and Shultz gravity station (Poisiet buy, Japan Sea coast, South part of Primoria, Far East of Russia). Tidal analyses were develop with two years series. Altimetric models was choose by observed results.

We used GPS method for navigation measurement at Far East of Russia from 2003 to 2014. Gravity observation was developed at the points at Shults cape. Observation started in 2010 year. We used absolute gravimeter and relative gravimeter for measurements. Different tidal models were examined by measurements. Space geodesy and gravity methods were used for the study of coseismic effect at the far zone of Japan earthquake 11.03.2011 (М = 9).

Current study of crust displacement and strain are impotent for geophysics tasks in time and in space. Different methods were used for deformation’s measurements into underground gallery and into key-hole. Experimental measurement results at Talaya station (Baikal region) were presented. Variation of tidal parameters allowed us estimate of cracking zone and of regional seismic activity.

The paper presents materials on seismicity and deep structure at DSS profiles in joint region of Eurasian, North American and Okhotomorsk continental plates. Complex analysis of deep seismic investigations and seismology materials shows that there is significant appearance of joint zone both in deep structures of the Earth`s crust and in the Moho. According to the DSS materials at fragments of regional 2-DV and 3-DV profiles there is registered significant decrease of boundary velocity values (to 7.5-7.7 km/sec) along the Moho in the joint zone, local raise of the Moho and reduced values of average velocities in the Earth`s crust. Joint zones of the plates are also characterized by high seismicity.

Gravity observation was developed at two points at Shults cape. We used GPS method for navigation measurement simultaneously. Observation started in 2010 year. Reduction task was solved. Measurement results were used for gravity field testing at continental boundary.

Experimental measurement results at transcontinental tidal profile: Atlantic coast of Europe south of Siberia -Pacific coast of Russia were presented. Earth tidal models were tested. Profile consisted of four stations located at West Europe. (Chize, Minipli, Modles,Uccle), two stations at the Siberian south (Kluchi and Talaya) and three stations at the Far East of Russia (Zabaikalskoe, Yuzhno-Sakhalinsk and Shults cape). Stations are situated at (45-55) north latitude and 0,4-142 west longitude allowed to estimate current tidal earth deformation models (WD93 DDW99) and ocean tide models (SCW80, CSR3, FES95, ORI96, CSR4, FES02, GOT00, NAO99 и TPX06).

The article describes GPS results for postseismic process of Chuya earthquake (Gornyi Altay, 27/09/2003), models and estimations of effective viscosity of geological medium.

One of parameter used for coseismic process modeling is effective elastic module. Periodic vertical motion by season loading for Sayano-Shushenskaya Hydro-Power Station dam was used for module estimation. Results of modeling for Tuva earthquake (27/12/2011) are presented. Displacement velocities for Sayan region were discussed. Velocities were received by space geodesy method and by hydro-leveling method.

Modern method and equipment allow make the measurement of gravity at 10-9 level from normal value g0 (up to 1 microgal = 10 nm/sec2). We exclude of systematic and periodic effects and after this procedure we must estimate the stability of earth's gravity at time. Space geodesy method (VLBI) can make estimation of the height (Earth radius) at 0.1 mm level. Experimental results were received by absolute laser ballistic gravimeters at our and foreign observatories. These results analyze for stability estimation of earth's gravity for last decades.