Conveners
O1.2 The Solid Earth and its Structure: part 1
- Gerhard Graham (CTBTO Preparatory Commission)
- Sherif Ali (CTBTO Preparatory Commission)
O1.2 The Solid Earth and its Structure: part 2
- Michelle Grobbelaar (Council for Geoscience)
- Ehsan Qorbani Chegeni (CTBTO Preparatory Commission)
P-to-S receiver functions of 10 broad-band seismographs installed along the geologically complicated edge of the Ethiopian plateau and the active Main Ethiopian Rift were examined to image the crustal structure beneath the region. Receiver functions were determined using the time domain iterative deconvolution method to calculate the Moho depth and Vp/Vs of the crust. Results indicate that the...
The Earth is a dynamic planet with abundant vibrating processes. Besides the earthquakes, volcanos and other activities, there is a special type of source called a persistent localized microseismic source, with long period almost harmonic signals and fixed location. The 26s (0.038Hz) and 28s (0.036Hz) tremors in the Gulf of Guinea are two typical persistent localized microseismic sources in...
The purpose of this research is to check the performance of the RsttMndc (enhanced RSTT model for Mongolia) model as a regional velocity model and the obtained minimum 1D velocity model for the Hangay region as a local model to relocate the events occurred in the Hangay region, central part of western Mongolia using iLoc4.0 location software comparing with the relocation results with RSTT...
Machine Learning for Travel Time emulation (MaLTTe) is a deep learning method and computer code for emulating seismic-phase travel times that are based on a three-dimensional (3-D) Earth model. Greater accuracy of travel time predictions using a 3-D Earth model are known to reduce the bias of event location estimates and improve the process of associating detections to events. However,...
On 20 December 2020 an earthquake shook Gaborone city and its outskirts. This earthquake was recorded by some stations of the Botswana Seismological Network and also some from the International Monitoring System. Vertical components seismograms from these stations were analysed using Geotool software from the Comprehensive Nuclear-Test-Ban Treaty Organization and the Regional Seismic Travel...
The Bolivian Orocline is part of the Central Andes, where the high compressional crustal strains owns complex systems of geological faults that may be active and might produce destructive earthquakes, such as the Aiquile 1998. Generally, some foreshock and aftershock happens, however, those may have lower magnitudes that are difficult to detect. Nowadays, it is possible to detect any seismic...
Two seismic discontinuities delimit the mantle transition zone (MTZ) at 410 and 660 km. These seismic discontinuities were imaged under the north-west corner of South America using the receiver function technique and a seismological record of up to 30 years collected by the National Seismological Network of Colombia. Significant variations and spatially systematic in the discontinuity depths...
A network of 20 seismogeodetic instruments was installed in the subduction zone of Mexico. The purpose of the data is to monitor the crustal deformation of the subduction zone, to estimate the magnitude of great earthquakes, and to contribute to the tsunami warning system of Mexico operated by the Mexican Navy. Information generated by the network is transmitted in real time by dedicated...
