Main fault tectonics of Meshkenet Tessera on Venus

1994 ◽  
Vol 65 (1) ◽  
pp. 55-70 ◽  
Author(s):  
J. Raitala
Keyword(s):  
Fault Tectonics ◽  
Main Fault

scholarly journals Geomorphological, hydrographical and sedimentological processes at the Serres basin due to quaternary fault tectonics

2001 ◽  
Vol 34 (1) ◽  
pp. 451
Author(s):  
Α. ΨΙΛΟΒΙΚΟΣ ◽  
Ε. ΒΑΒΛΙΑΚΗΣ ◽  
Κ. ΒΟΥΒΑΛΙΔΗΣ ◽  
Ε. ΠΑΠΑΦΙΛΙΠΠΟΥ-ΠΕΝΝΟΥ
Keyword(s):  
Tectonic Activity ◽  
Alluvial Fans ◽  
Quaternary Deposits ◽  
Sediment Delivery ◽  
Active Tectonic ◽  
Fault Tectonics ◽  
High Zone ◽  
Neogene Sediments ◽  
Main Fault ◽  
Inner Parts

On the S W foothills of Mt. Menikion and the NE part of Serres basin, four zones of composite alluvial fans have been formed. The upper zone of thick hard fanglomerates lies at altitudes of 280 to 600 m on Mt. Menikion schists and marbles. The high zone of loose fanglomerates, with red-brown sand matrix, lies at altitudes of 200 to 350 m on the neogene deposits. The intermediate zone of mixed coarse and fine elastics lies at altitudes of 80 to 140 m on neogene deposits. The lower zone of gravel, sand and silt deposits lies at altitudes of 10 to 60 m on quaternary terrace deposits. Each zone is approximately 13 - 17 km long and 1-2 km wide, with E/SE - W/NW trend, almost parallel to the main fault lines of the area. The fan zones were deposited along the slopes of Mt. Menikion and Serres basin, owing to the fault tectonics of the area. Several E/SE - W/NW trending parallel to each other listric faults, were formed on the basement on Mt. Menikion and the neogene deposits of Serres basin. Their blocks slided and turned downstream along the faults, so that their surface inclined backwards. Close to the faults, parallel valleys were formed. They filled up with quaternary deposits, brought down by activated torrents. The torrents flowed transversely to the fault blocks. At the inner parts of the blocks they deposited clastic material in the form of alluvial fans. In the outer – higher part of the blocks they were incised in the rocks or the neogene sediments, to form narrow valleys, with terraces along their walls. The staircase development of the relief finally resulted in a staircase development of the fan zones. The two zones, upper and high, seem to be Pleistocene in age and the torrents have already incised in the fan material. The two zones, intermediate and lower, seem to be Holocene in age and are still active. Tectonic activity seems to have been the main cause of sediment entrapment in the Serres basin and the low sediment delivery rate of the river Strymon during the Quaternary.

scholarly journals Who is the African Farmer? The Importance of Actor Representations in the Debate About Biotechnology Crops in Africa

2021 ◽  
Vol 34 (1) ◽  
Author(s):  
Koen Beumer ◽  
Jac. A. A. Swart
Keyword(s):  
Gene Editing ◽  
Smallholder Farmers ◽  
Agricultural Biotechnology ◽  
Agricultural Change ◽  
World Summit ◽  
Crucial Aspect ◽  
Kwazulu Natal ◽  
Main Fault ◽  
Biotechnology Crops ◽  
The Impact

AbstractThe discussion about the impact of agricultural biotechnology on Africa is deeply divided and contains widely diverging claims about the impact of biotechnology on African farmers. Building upon literature on the ‘good farmer’ that highlights that farmers identities are an important factor in explaining the success or failure of agricultural change, we argue that the identity of the farmer is an undervalued yet crucial aspect for understanding the debate about the impact of agricultural biotechnology on African farmers. In this article we therefore investigate what farmers’ identities are implicated in the arguments about the impact of biotechnology on African farmers. We aim to identify the main fault lines in different accounts of the African biotechnology farmer by analysing the identities ascribed to them in two prominent cases of controversy: the debates at the 2002 World Summit on Sustainable Development in Johannesburg and the discussion about the impact of biotechnology on smallholder farmers in the Makhathini flats in KwaZulu Natal, South Africa. Our findings demonstrate that arguments about biotechnology are informed by diverging conceptions of who the African farmer is, what is important for the African farmer, and what role the African farmer has in relation to agricultural biotechnology. These findings remain relevant for current discussions on gene editing technologies like CRISPR-Cas. Openly discussing these different views on the identity of smallholder farmers is crucial for moving forward in the biotechnology controversy and can inform future attempts to elicit the farmer’s voice.

Research on Roller Bearing with Fault Diagnosis Method Based on EMD and BP Neural Network

2014 ◽  
Vol 1014 ◽  
pp. 501-504 ◽  
Author(s):  
Shu Guo ◽  
You Cai Xu ◽  
Xin Shi Li ◽  
Ran Tao ◽  
Kun Li ◽  
...  
Keyword(s):  
Neural Network ◽  
Fault Diagnosis ◽  
Bp Neural Network ◽  
Roller Bearing ◽  
Vibration Signal ◽  
Classification Performance ◽  
Outer Race ◽  
Mode Decomposition ◽  
Diagnosis Method ◽  
Main Fault

In order to discover the fault with roller bearing in time, a new fault diagnosis method based on Empirical mode decomposition (EMD) and BP neural network is put forward in the paper. First, we get the fault signal through experiments. Then we use EMD to decompose the vibration signal into a series of single signals. We can extract main fault information from the single signals. The kurtosis coefficient of the single signals forms a feature vector which is used as the input data of the BP neural network. The trained BP neural network can be used for fault identification. Through analyzing, BP neural network can distinguish the fault into normal state, inner race fault, outer race fault. The results show that this method can gain very stable classification performance and good computational efficiency.

Complex Slip Distribution of the 2021 Mw 7.4 Maduo, China, Earthquake: An Event Occurring on the Slowly Slipping Fault

2021 ◽  
Author(s):  
Rumeng Guo ◽  
Hongfeng Yang ◽  
Yu Li ◽  
Yong Zheng ◽  
Lupeng Zhang
Keyword(s):  
Slip Rate ◽  
Slip Distribution ◽  
Seismic Gap ◽  
Seismogenic Fault ◽  
Coseismic Slip ◽  
Slip Rates ◽  
Kunlun Mountain ◽  
Coulomb Failure ◽  
Main Fault ◽  
Large Earthquakes

Abstract The 21 May 2021 Maduo earthquake occurred on the Kunlun Mountain Pass–Jiangcuo fault (KMPJF), a seismogenic fault with no documented large earthquakes. To probe its kinematics, we first estimate the slip rates of the KMPJF and Tuosuo Lake segment (TLS, ∼75 km north of the KMPJF) of the East Kunlun fault (EKLF) based on the secular Global Positioning System (GPS) data using the Markov chain Monte Carlo method. Our model reveals that the slip rates of the KMPJF and TLS are 1.7 ± 0.8 and 7.1 ± 0.3 mm/yr, respectively. Then, we invert high-resolution GPS and Interferometric Synthetic Aperture Radar observations to decipher the fault geometry and detailed coseismic slip distribution associated with the Maduo earthquake. The geometry of the KMPFJ significantly varies along strike, composed of five fault subsegments. The most slip is accommodated by two steeply dipping fault segments, with the patch of large sinistral slip concentrated in the shallow depth on a simple straight structure. The released seismic moment is ∼1.5×1020  N·m, equivalent to an Mw 7.39 event, with a peak slip of ∼9.3 m. Combining the average coseismic slip and slip rate of the main fault, an earthquake recurrence period of ∼1250−400+1120  yr is estimated. The Maduo earthquake reminds us to reevaluate the potential of seismic gaps where slip rates are low. Based on our calculated Coulomb failure stress, the Maduo earthquake imposes positive stress on the Maqin–Maqu segment of the EKLF, a long-recognized seismic gap, implying that it may accelerate the occurrence of the next major event in this region.

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