Local earthquake tomography has been carried out in the Tjörnes Fracture Zone. This transform region connects Mid-Atlantic Ridge to Northern Volcanic Zone Iceland a mostly offshore area. The challenge record seismic information this area was motivation for North ICeland Experiment (NICE). Fourteen ocean-bottom seismometers and eleven on-land stations were installed project operated simultaneous...

[1] Lineaments in the gravity field and associated chains of volcanic ridges are widespread on the Pacific plate but are not yet explained by plate tectonics. Recent studies have proposed that they are warps and cracks in the plate caused by uneven thermal contraction of the cooling lithosphere. We show that the large thermoelastic stress produced by top-down cooling is optimally released by li...

The objective of this investigation was to determine the feasibility of mapping lineaments on Landsat images of ElRouge, and Al-Ghab depressions, north-west of Syria, and to determine the tectonic significance of these lineaments in order to evaluate the capabilities and limitations of spaceborne data to prove that El-Rouge depression is the extension of Al-Ghab depression and both of them in l...

First posted April 5, 2023 For additional information, contact: Contact Information,Geology, Minerals, Energy, & Geophysics Science CenterMenlo Park, CaliforniaU.S. Geological SurveyBuilding 19, 350 N. Akron Rd.P.O. Box 158Moffett Field, CA 94035 This preliminary geologic map presents mapping of the Leuhman Ridge area Edwards Air Force Base, California, conducted between 2020 and June 2021. The...

In recent years, underactuated nonlinear dynamic systems trajectory tracking, such as space robots and manipulators with structural flexibility, has become a major field of interest due to the complexity and high computational load of these systems. Hierarchical sliding mode control has been investigated recently for these systems; however, the instability phenomena will possibly occur, especia...

We have analysed 721 earthquakes (1.5jmbj5.0) of the 1993–1994 Western Almerı́a (southern Spain) series and the following seismicity in the area until 1998. Among the data there are several multiplets, events characterized by very similar seismograms at the short-period stations of the local network. We detected similar seismograms using crosscorrelation analysis of the P and S arrivals and clas...

Edge detection and edge enhancement techniques play an essential role in interpreting potential field data. This paper describes the application of various edge detection techniques to gravity data in order to delineate the edges of subsurface structures. The edge detection methods comprise analytic signal, total horizontal derivative (THDR), theta angle, tilt angle, hyperbolic of tilt angle (H...

current research in order to identify neo tectonic activity of the ziyarat basin has been made on the northern slopes of the eastern alborz in south-gorgan and using the index of morpho tectonic and tectonic evidence in the area. in this regard, the 6 morphological parameters were calculated and the results are analyzed. the overall results of these features, as indicators of the relative activ...

Understanding the interaction between tectonics, climatically-driven surficial processes, and bedrock erodibilityprovides insight into how landscape develops over space time. Although numerous active faults, lithologicand climatic variability control across Northern Thailand, influence of these factors on thespatial adjustment a dynamic is largely unknown. In study, we focus lower-order channel...

Estimating the expected size of the largest earthquake on a given fault is complicated by dynamic rupture interactions in addition to geometric and stress heterogeneity. However, a statistical assessment of the potential of seismic events to grow to larger sizes may be possible based on variations in magnitude distributions. Such variations can be described by the b-value, which quantifies the ...