TRENDING
LOOKING BEYOND ITALIAN SPACE DAYزلزال شرق جزيرة كريت بقوة 5.6 بمقياس ريختريوم الفضاء العالميSecond Advanced ArAS School for AstrophysicsName Exo Worlds“ندوة بعنوان”المُناخ ما بين الطبيعة الأرضية والفلك (هموم وحلول)إكتشاف نجمًا متغيرًا جديدًا لفريق بحثى بالمعهدوزير التعليم العالي يرأس اجتماع مجلس إدارة المعهد القومي للبحوث الفلكية والجيوفيزيقيةEgypt-Greece Joint-workshop on the Eastern Mediterranean Sea: Tectonics and Seismicityيستضيف المعهد وفدا من منظمة حظر التجارب النووية لدعم التعاون الفنيآثار عين شمس توقع مذكرة تفاهم مع المعهد القومى للبحوث الفلكية والجيوفيزيقيةاليوم العالمى للمرأة والفتيات فى الفلكوزير التعليم العالي يستعرض تقريرًا حول زيارة باحثي “القومي للبحوث الفلكية” لدولة الإمارات العربية المتحدةبيان زلزال شمال شرق بني سويف – الثلاثاء 1/2/2022WORKSHOP: “Kottamia Practical Workshop for Young Astronomers”The Fourth Spectroscopy Winter School SWS-4بيان عن حدوث زلزال صباح يوم الثلاثاء الموافق 11/1/2022Second Advanced ArAS School for Astrophysicsتغطية خاصة/الصاروخ الصيني الخارج عن السيطرةMinister of Higher Education and Scientific Research, chaired the Board of Directors of NRIAG

Gravity Lab.

 

Prof. Salah Saleh
Head of Gravity Laboratory

Gravemetry Laboratory

The lab is the only one in Egypt specializing in the field of gravity and its various applications in geodesy and applied geophysics. The Lab has staff experts in the field of detailed, precis and micro-gravity applications, the applications of the gravity in Geodesy and geodynamics and different applications of satellite gravimetry.  Moreover, continues gravity observations and Earth tides is an important topics for our laboratory. Also, our lab is interested in tide gauges measurements and satellite altimetry for sea water rising and inland water monitoring. Three absolute gravity stations (Helwan, Aswan and Mersa Matruh) from the absolute gravity network of Egypt are located in the institute buildings, the main Absolute gravity station of Egypt is Helwan Observatory Absolute gravity station which is located in the main buildings of our institute and all are belong to our lab.

The lab has different kinds of relative gravimeters (Lacoste & Romberg models G 1043 and D 218, Scintrex CG5 and ZLS). Other two tide gravimeters ET16 and ET 18 (German instruments by scientific cooperation agreements) are running for continuous measurements and other Earth tidal study purposes.

NameٍTitleInternal PhoneCell PhoneE-Mail

Salah Saleh

Prof. Head of Gravity Laboratory 1289+201099343582salahsmm@yahoo.com

Khaled Zahran


Prof. Head of Geodynamic Department 1356+20100 560 7585zahran@nriag.sci.eg

Elsayed Abdelazim Issawy

Prof. Head of Aswan Center 1356+201005241812issawy@yahoo.com

Basem Elsaka
Prof. Dr. basem_elsaka2002@yahoo.com

Karem Fathy
Doctor 1374+201220997609karemphysic@yahoo.com

Mohamed Sobh Emam
Doctor 1374+201063027082mohamedsobh35@yahoo.com

Soha Reda Hassan
Doctor 1293+201019644333soha1987_reda@yahoo.com

Mostafa A. M. Elwan
Assistant Researcher1374+201019889710mostafaelwan40@yahoo.com

Moataz S. A. Ibrahim
Assistant Researcher1374+201119907628geomoataz2012@yahoo.com

Hesham El haddad
Researcher Assistant1374+201210329331heshamsabry@nriag.sci.eg
Ahmed ElgarhyAssistant Researcher1374+201022844553eng.ahmedelgarhy@yahoo.com

Mohamed Hussien
Assistant Researcher1374+201098262333mohamedhussien@yahoo.com

 The activities of our lab are summarized in the following fields:

Detailed gravity survey for the purposes of Bouguer anomaly maps establishment, Geoid undulations, delineating subsurface geologic structures for Petroleum, mineral, geothermal, underground water exploration as well as seismology, lithosphere and Basement relief studies.

– First order gravity Base station establishments.

– Microgravity measurements for Archaeology, site selections, Caves detections, on-site inspection (OSI) (CTBTO) and other engineering problems.

– 4D gravity measurements for geodynamics and crustal movements studies by monitoring the temporal density variations around the seismic-active zones and faults.

 – Monitoring of different kind of reservoirs using 4D gravity studies like geothermal and underground water.

– Continuous gravity measurements in order to study Earth elasticity, Earth tides, frequent instrument calibration for the other relative gravimeters.

– Tide gauges measurements and satellite altimetry observations for different locations in Egypt in order to monitor sea level rising, Delta sinking as well as inland water monitoring.

– Different applications of Satellite Gravimetry (Regional structure geology, temporal gravity variations, water mass changes, ….etc.

Some Applications of Gravity Method

Geoid

The determination of the geoid has been one of the prime goals of geodesy. Knowledge of geoid undulations with respect to some reference surface was needed for the determination of the figure of the earth, for the precise reduction of distance measurements to a reference ellipsoid, and for the determination of the geocentric location of points on the surface of the earth. Currently and in the future, undulation information can also be used in geophysical studies related to crustal structures and in oceanographic studies related to sea surface topography. The actual determination of global geoids has been carried out by using gravimetric data, satellite‐derived information related to the gravitational field of the earth, or a combination of the two techniques. Regional geoid determinations have been made by astro-geodetic techniques. For some applications of undulation information, undulation standard deviations of the order of ±5 m would be sufficient (Rapp, 1974). Such accuracy can be obtained by using data currently available. In the past few years, renewed interest in the geoid arose when the concept of satellite altimetry was proposed to measure the distance from the satellite to some area on the ocean surface.

Archaeology

      Our Gravity lab is the pioneer in the field of archeo-geophysical prospecting in our institute and in Egypt too. The archeo-geophysicl prospecting started in our lab in 1997 by studying the applicability of the micro-gravity investigations in archaeo-prospecting and detecting some known and unknown hidden features in the Valley of the Kings as well as the tomb of Nefertari, Valley of Queens, Luxor, Egypt.  These studies were followed later by many research papers and scientific research projects.

Crustal deformation and Geodynamics

Temporal gravity variations approved an important method for detecting the vertical movement of recent crustal deformation. The ongoing gravity and GPS observations can monitor the crustal movements by detecting the vertical component of recent crustal movement and mass redistribution. The correlation between temporal gravity variations have not direct relation to Earthquake activities but if the variations of gravity field are inhomogeneous in the space-time distribution it cloud reflect clearly the development and occurrence of earthquake. The co-seismic and post-seismic signature of the seismic events on temporal gravity variations nowadays are widely monitored by GRACE Satellite Gravimetry. The geodynamic studies and recent crustal deformation using temporal gravity variations by our lab were early started in 1994 in Aswan region. But only in 1997 was a new epoch of long-term investigation initiated.  The temporal non-tidal changes of gravity exceed the level of confidence significantly. The changes were compared with older available geodetic data. The successful campaigns of gravity measurements for local and regional geodetic networks around the High dam are annually performing. Other two gravity networks were later established and measured periodically as the network around Greater Cairo and Sinai.In additions, the temporal gravity variations are using to monitor the different kind of reservoirs like geothermal and underground water basins.

Geotechnical & Civil Engineering

Gravity can detect Voids or Cavities whether they are tunnels washouts or sinkholes, also can be used to study the integrity of roads, dams, and dikes, looking for areas of weakness in the sub-surface

Moho depths and lithosphere modelling

The use of a seismic velocity measurement as the only indication of rock density does not provide a useful constraint when attempting to reproduce observed gravity variations. An appropriate model for isostatic compensation is probably the most important factor for successful predictions of crustal structure on the basis of gravity data P.J. Barton (1986). The lithosphere is the outermost, relatively rigid shell of the Earth, made up of the crust and the underlying lithospheric mantle. Gravity gradients of the GOCE (Gravity field and steady state Ocean Circulation Explorer) mission are available and provide free available data with global homogeneous coverage. The spatial resolution is about 80 km which makes it possible to construct regional models of large or remote areas. Gravity gradient data are sensitive to geometry and density variations of the main lithospheric layers, i.e. sediment thickness, the Moho depth and the temperature and composition of the upper mantle. The measured “free air” gravity gradients still include the effect of topographic masses. The topography causes the strongest gravity gradient effect and has to be subtracted to unravel the lithospheric signal. Examples of Moho depth (Seismically-constrained gravity inversion) and Lithospheric Modelling are performed by our lab.

Oil & Gas Exploration:

Gravity can be used to determine the location of a Salt dome in which oil or gas could be present. Measuring the density change in an oil reservoir can assist in the oil and gas recovery process. It’s also used to determine Subsurface Structures and Basement delineation.

Mineral Exploration

Gravity can detect Volcanic Massive Sulphides deposits associated with nickel deposits, diamond bearing Kimberlites, Banded Iron Formations, and Impact Basins. Gravity can also be used to determine the size of the deposit.

Satellite Gravity data derived from GRACE and GOCE

Satellite Gravity data derived from GRACE and GOCE Used in the detection of global targets such as regional underground aquifers, source rock maturation, and Moho boundary delineation.

Devices owned by Gravity Laboratory and Soil Unit

Gravity Laboratory Instruments

scintrex 2

Scintrex CG5

ZLS

ZLS Gravimeter

Lacoste & Romberg models G 1043

Lacoste & Romberg models D 218

              Tide Master

Soil Unit Instruments

 Soil unit is a small unit related to gravity lab. It is concerned with describing and classifying soils giving uniform system of classification with uniform nomenclature in order to correlate the soils of different area. Also, To provide data for making interpretations as to the adaptability of particular soils for construction, agricultural purpose and also for many other engineering purposes (as in soil management).

 

 MOTORIZED SAND 
EQUIVALENT SHAKER

This test provides a constant uniform shaking with automatic cycle test. Oscillating excursion is 203 mm at 175÷180 adjustable strokes/ min. rate. Complete with digital timer that automatically stops the shaker at the end of the test. It cannot be sold in CE markets without security cabinet
Power supply: 230V 1ph 50 Hz 250 W
Dimensions: 700x360x350 mm.
Weight: 30 kg

 RELATIVE DENSITY
OF COHESIONLESS SOIL

This test covers the determination of the maximum dry density and the water content (humidity/density ratio) of cohesionless mixtures to be used in road construction, and where the max density by the impact method is lower than the vibratory method.

CBR,Loading Machine

           CBR, LA CBR 
         LAODING MACHINE

Unconfined compression tester

This hand-operated tester, utilized both on site and in laboratory, applies the load by a hand wheel and strength is read on a proving ring 200 kg. capacity. The apparatus can test samples up to dia. 80 mm. x 200 mm height. The load is applied through a mechanical jack with handwheel. The upper beam can be adjusted.

Direct Shear Test Machine

 DIRECT/RESIDUAL 
SHEAR TEST APPARATUS

Used to determine the resistance to shearing of all types of soil specimens both consolidated and drained, undisturbed or remoulded samples.
The machine can accommodate specimens dia. 50, 60, 100 mm, and square 60×60, 100×100 mm.
The apparatus is equipped with a control closed loop motor with epicycloid reducers.

At the beginning of each test, the machine performs an automatic and complete internal check, a position reset with the elimination of all possible positioning errors and all pauses.
The input of all the test patterns is achieved by the interaction of the keyboard and the alphanumeric display with self-memory, thus granting infinitesimal resolutions in short times.
Possibility to fix maximum excursion of the shear box, so as to interrupt automatically the test.
It is possible to input a different return speed (residual shear) in relation to the one used for the shear test, thus allowing a quick playback to select the residual shear test, saving a lot of time.

Testing Samples

Testing Samples

Edited by: Mostafa Elwan.

[cbxpoll id=”9161″]
  • 4d toto macau
  • bandar togel
  • bo togel
  • bo togel
  • bandar togel
  • agen togel terpercaya
  • bandar togel terpercaya
  • dingdong togel
  • bandar togel online terpercaya
  • situs agen togel online
  • agen togel online terpercaya
  • bandar togel terbaik dan terpercaya
  • situs agen togel online
  • situs judi togel online
  • situs agen togel terpercaya
  • situs togel
  • daftar bandar togel online terpercaya
  • situs agen togel resmi
  • daftar bandar togel online terpercaya
  • daftar bandar togel online
  • situs agen togel terpercaya
  • situs agen togel online
  • agen togel resmi di indonesia
  • situs agen judi togel
  • situs togel
  • daftar bandar togel terbesar dan terpercaya
  • situs slot
  • bo togel online terpercaya
  • agen togel
  • bandar togel lengkap terbesar
  • togel online
  • bo togel terpercaya dan terbesar
  • aftar situs slot online
  • agen judi togel online
  • nama situs togel terpercaya
  • judi slot online
  • situs togel resmi toto
  • 10 situs togel terpercaya
  • situs togel resmi toto
  • bandar togel online
  • situs togel online terpercaya
  • situs judi togel resmi
  • situs judi togel online
  • bandar togel china resmi
  • bandar togel terpercaya
  • situs bandar togel toto online
  • situs judi togel 4d resmi
  • bandar togel hadiah 4d 10 juta
  • situs togel terbaik dan terpercaya
  • agen togel resmi di indonesia
  • bandar togel toto hongkong
  • bo togel bonus new member terbesar
  • situs slot deposit pulsa tanpa potongan
  • bo togel resmi di indonesia
  • daftar bandar togel terbesar dan terpercaya
  • situs judi togel online
  • agen bandar togel toto online
  • bandar lotre togel online
  • situs judi slot terbaik
  • situs togel resmi toto
  • bandar togel cambodia resmi
  • situs bo togel resmi
  • bandar togel hadiah 4d 10 juta terpercaya
  • bandar togel online terpercaya
  • agen bandar togel online
  • bo slot online terbaik
  • bandar togel online terbesar
  • bandar togel terpercaya dan terbesar
  • 10 situs togel terpercaya resmi
  • bandar togel terpercaya dan resmi
  • situs togel resmi dan terpercaya
  • situs bandar lotre togel
  • keluaran togel cambodia
  • situs togel online
  • situs agen togel online
  • bandar judi togel online
  • agen bandar togel online
  • situs togel terbaik
  • agen togel online terbesar
  • situs togel terpercaya dan terbesar
  • agen togel
  • bandar togel terbesar
  • situs judi slot
  • agen togel
  • daftar bandar togel terbesar dan terpercaya
  • bandar togel
  • situs togel
  • situs slot
  • bandar togel
  • slot resmi
  • Bandar Judi Togel Hari Ini Online24Jam Terpercaya 2022
  • bo togel
  • toto togel
  • togel deposit pulsa
  • togel hongkong
  • togel online
  • situs togel
  • situs bandar togel online terpercaya
  • bandar togel
  • agen togel terpercaya
  • situs togel
  • nama toto togel
  • togel online
  • togel online
  • situs togel
  • agen togel resmi
  • agen togel
  • situs togel
  • bandar togel
  • bandar togel
  • togel online
  • asia togel
  • situs togel
  • situs togel
  • situs togel
  • toto togel
  • togel online
  • bandar togel
  • agen togel
  • daftar togel
  • bandar togel
  • agen togel
  • situs togel online
  • situs togel
  • bandar togel
  • bandar togel
  • situs togel terpercaya
  • agen togel
  • situs judi togel
  • situs togel
  • agen togel
  • bandar togel
  • situs togel
  • situs togel
  • bo togel
  • agen togel
  • toto togel
  • bo togel
  • situs togel terpercaya
  • situs bandar togel
  • agen togel terpercaya
  • 5 bandar togel terpercaya
  • bo togel resmi
  • agen togel
  • situs togel online
  • situs togel resmi
  • daftar bandar togel
  • situs agen togel resmi
  • 4d toto macau
  • bandar togel
  • bo togel
  • 10 situs togel terpercaya
  • bandar togel
  • agen togel terpercaya
  • bandar togel terpercaya
  • dingdong togel
  • bandar togel online terpercaya
  • situs agen togel online
  • agen togel online terpercaya
  • bandar togel terbaik dan terpercaya
  • situs agen togel online
  • situs judi togel online
  • situs agen togel terpercaya
  • situs togel
  • daftar bandar togel online terpercaya
  • situs agen togel resmi
  • daftar bandar togel online terpercaya
  • daftar bandar togel online
  • situs agen togel terpercaya
  • situs agen togel online
  • agen togel resmi di indonesia
  • situs agen judi togel
  • daftar bandar togel terbesar dan terpercaya
  • situs slot
  • bo togel online terpercaya
  • agen togel
  • bandar togel lengkap terbesar
  • togel online
  • bo togel terpercaya dan terbesar
  • aftar situs slot online
  • agen judi togel online
  • nama situs togel terpercaya
  • judi slot online
  • situs togel resmi toto
  • 10 situs togel terpercaya
  • situs togel resmi toto
  • bandar togel
  • situs togel online terpercaya
  • situs judi togel resmi
  • situs judi togel online
  • bandar togel china resmi
  • bandar togel terpercaya
  • situs bandar togel toto online
  • situs judi togel 4d resmi
  • bandar togel hadiah 4d 10 juta
  • situs bandar togel
  • agen togel resmi di indonesia
  • bandar togel toto hongkong
  • bo togel bonus new member terbesar
  • situs slot deposit pulsa tanpa potongan
  • bo togel resmi di indonesia
  • daftar bandar togel terbesar dan terpercaya
  • situs judi togel online
  • agen bandar togel toto online
  • bandar lotre togel online
  • situs judi slot terbaik
  • situs togel resmi toto
  • bandar togel cambodia resmi
  • situs bo togel resmi
  • bandar togel hadiah 4d 10 juta terpercaya
  • agen bandar darat togel
  • agen bandar togel online
  • bo slot online terbaik
  • bandar togel online terbesar
  • bandar togel terpercaya dan terbesar
  • 10 situs togel terpercaya resmi
  • bandar togel terpercaya dan resmi
  • situs togel resmi dan terpercaya
  • situs bandar lotre togel
  • togel online
  • situs togel online
  • situs agen togel online
  • bandar judi togel online
  • agen bandar togel online
  • situs togel resmi
  • agen togel online terbesar
  • situs togel terpercaya dan terbesar
  • agen togel
  • bandar togel hadiah 4d 10 juta
  • situs judi slot
  • agen togel
  • daftar bandar togel terbesar dan terpercaya
  • bandar togel
  • situs togel
  • situs slot
  • bandar togel
  • slot resmi
  • Bandar Judi Togel Hari Ini Online24Jam Terpercaya 2022
  • bo togel
  • toto togel
  • togel deposit pulsa
  • togel hongkong
  • togel online
  • situs togel
  • situs bandar togel online terpercaya
  • bandar togel
  • agen togel terpercaya
  • situs togel
  • nama toto togel
  • togel online
  • togel online
  • situs togel
  • agen togel resmi
  • agen togel
  • situs togel
  • bandar togel
  • bandar togel
  • togel online
  • asia togel
  • situs togel
  • situs togel
  • situs togel
  • toto togel
  • togel online
  • bandar togel
  • agen togel
  • daftar togel
  • bandar togel
  • agen togel
  • situs togel online
  • situs togel
  • bandar togel
  • bandar togel
  • situs togel terpercaya
  • agen togel
  • situs judi togel
  • situs togel
  • agen togel
  • bandar togel
  • bo togel
  • bo togel
  • toto togel
  • bo togel
  • situs togel terpercaya
  • situs bandar togel
  • agen togel terpercaya
  • bo togel resmi
  • situs togel online
  • situs togel resmi
  • daftar bandar togel
  • situs agen judi togel
  • agen bandar togel
  • 5 bandar togel terpercaya
  • agen togel
  • bandar togel terpercaya
  • 10 situs togel terpercaya
  • situs agen togel resmi
  • situs agen togel resmi
  • bo togel online
  • situs togel
  • situs togel
  • situs agen togel
  • situs togel online
  • agen togel online
  • bandar togel terpercaya
  • toto togel
  • situs togel terpercaya
  • 5 bandar togel terpercaya
  • agen bandar togel resmi
  • situs togel terpercaya
  • bandar togel terpercaya
  • situs togel terpercaya
  • bo toto togel
  • situs resmi pasang togel
  • situs togel online
  • situs togel terpercaya
  • agen togel
  • situs judi togel online
  • situs togel terpercaya
  • situs togel
  • situs bo togel
  • bandar togel terpercaya
  • agen togel resmi
  • bandar togel terpercaya
  • daftar togel via dana
  • situs togel terpercaya
  • situs togel resmi
  • situs togel terpercaya
    situs togel agen togel agen togel toto situs togel online terpercaya situs agen togel resmi bandar togel terpercaya togel online situs togel terbaik situs togel 5 bandar togel terpercaya situs togel online situs togel online agen bandar togel situs togel terbesar situs togel online situs togel terpercaya agen togel resmi bandar togel terpercaya situs togel deposit pulsa daftar situs togel terpercaya keluaran semua togel hari ini situs togel resmi toto situs judi togel online bo togel terpercaya agen togel online agen togel terpercaya bandar togel terpercaya bo togel hadiah terbesar agen bandar togel bandar togel hadiah 2d 100rb bandar togel resmi situs resmi pasang togel 10 situs togel terpercaya agen togel terpercaya agen togel agen togel resmi bandar togel online 10 situs togel terpercaya bandar togel terpercaya bandar togel resmi agen togel resmi situs togel terpercaya agen togel singapore bandar togel terpercaya agen togel terpercaya situs agen togel online situs togel agen togel bandar judi togel bandar togel terpercaya situs agen togel terpercaya situs agen togel resmi situs agen togel terpercaya bo togel terpercaya situs agen togel terpercaya situs togel online daftar situs togel terpercaya situs bandar togel online situs bandar togel resmi situs agen togel resmi situs togel terbesar situs agen togel online situs togel online terpercaya agen togel online resmi situs agen togel online agen bandar togel terpercaya situs judi togel online bo togel hadiah 2d 100rb situs agen togel terpercaya situs agen togel online situs bo togel hadiah terbesar situs agen judi togel situs togel terpercaya situs agen togel resmi agen togel online 10 situs togel terpercaya situs togel deposit pulsa situs resmi pasang togel daftar togel toto online agen togel online 10 situs togel terpercaya bo togel terpercaya daftar situs togel terbaik agen toto togel bandar togel terpercaya bandar togel terpercaya bandar togel terpercaya situs agen judi togel situs togel online terpercaya bandar togel terpercaya agen judi togel online situs togel online terpercaya 5 bandar togel terpercaya 10 situs togel terpercaya bo togel terpercaya situs togel deposit pulsa bandar togel online bo togel bolak balik agen togel resmi situs togel online24jam terpercaya situs agen togel terbesar