Colombia earthquakes

The canyons of the Chicamocha form part of Vargas' Caldas Tear. Imagine a giant hernia tucked beneath the Earth’s surface that pushes tectonic plates downwards as pressure builds before a powerful earthquake. By pushing the plates towards a liquid core, this hernia, or “tear,” as experts call this geological curiosity, acts as a seismic cushion.On Monday, October 11, 12 seismic bursts were recorded in the Chicamocha Canyon, all spaced within 100 km of Mesa de los Santos. Just before midnight, a strong 4.9- magnitude quake shook the department of Santander and its capital Bucaramanga. The quake, with epicenter near Jericó, Santander, was also felt across the Magdalena valley in Medellín, Pereira and Ibagué. In Bogotá, the quake rattled furniture and startled residents.Colombia is a fractured nation. River valleys break through canyons, Andean mountain ranges rise from tropical basins, and snowcapped volcanoes loom over small cities. Powerful tectonic movements are continually pushing and shoving the topography.For geologist Carlos Alberto Vargas of the Universidad Nacional, the mineral fissure that slices across the Magdalena River valley won’t spare Colombia from devastating earthquakes – or a “Big One” as predicted for more than a century – but it does help defuse pent-up energies of colliding subducting plates. Vargas’ findings were published by the Seismological Society of America (BSSA) under the title ‘Caldas Tear resolves puzzling seismic activity beneath Colombia’.According to this researcher, the fissure cuts East – West across the central regions of the country, absorbing pressure from three continental plates – Panama, Nazca,

Course but Sloveniano Scotland but Austriaa long arguing about how dense the quality is in africa but then picking 7 out of 9 seeded teams to top the groups.and why on earth is predicting 80% a success?Before anyone give his opinion on the 48, can we start a bet on when Kami will revise his predictionsI say, it will be in November 2023. Who bets against it? Internazionale Milano Albania Mar 14, 2017 Hamburg Club: FC Internazionale Milano Nat'l Team: Albania Jul 28, 1999 Smurf Village Club: San Jose Earthquakes Nat'l Team: United States If you took the September 2019 FIFA rankings and used it to make a 2022 prediction by just taking the highest-ranked teams from each confederation, with no consideration for the draws, you would have been 77.4% correct (24 of 31, no prediction necessary for the host slot). At a bare minimum, a good prediction model should beat that.(The seven missed would have been Italy, Sweden, Colombia, Chile, Nigeria, Algeria, and Jamaica.) Athlone and r0adrunner repped this. Internazionale Milano Albania Mar 14, 2017 Hamburg Club: FC Internazionale Milano Nat'l Team: Albania I would need at least 37 teams right to match that.Every cycle is different. The last cycle by en large saw few surprises compared to previous ones.There is no guarantee it will stay like that.I feel I didn't take too many risks but I didn't play it safe either. It's in the balance. So if I nail most of my surprises I could end up with

Value decreases with increasing differential stress. A number of large earthquakes have been convincingly shown to have ruptured areas with distinctly low pre-mainshock b values (e.g., Tormann et al., 2015; Gulia et al., 2016), and some recent studies used the b value to identify foreshocks (e.g., Gulia and Wiemer, 2019; Dascher-Cousineau et al., 2020).Because the tidal triggering of an earthquake can be observed under the critical stress state and the b value can be an indicator of the stress state, increasing tidal triggering signals and decreasing b values are expected to be observed synchronously. Nevertheless, most of the evidence for tidal triggering of earthquakes, particularly the precursory signals related to tidal triggering prior to large earthquakes, has been observed in oceanic settings; in continental settings, correlations between tidal loading and seismicity are rarely identified. In this study, we focused on the 20 June and 9 August 2011 Tengchong earthquakes, located in the intracontinental Gaoligong Shear Zone (GLGSZ), which features extensive geothermal activity (Fig. 1). The global centroid moment tensor solutions for these two events show magnitudes of Mw 5.1 and 5.0 (Figs. S1 and S2), respectively, which are the largest and only earthquakes with Mw≥5.0 since 1976 in the study area. We examined temporal changes in correlations between tides and earthquakes and the b value evolution for detecting possible precursory signals prior to these two earthquakes. The results inform a discussion of the possible causes of tidal sensitivity of earthquakes in this region.Section snippetsTectonic settingThe ongoing continental collision between the

There so many earthquakes in Nepal recently?The high frequency of earthquakes in Nepal is attributed to the continuous interaction and collision between the Indian and Eurasian tectonic plates. The accumulated stress along the plate boundary periodically releases as earthquakes, leading to frequent seismic activity in the region.How frequent are earthquakes in Nepal?Nepal experiences frequent earthquakes, with hundreds of earthquakes of magnitude greater than 4 occurring every year. The continuous convergence of the Indian plate beneath the Eurasian plate in the Hindu-Kush-Himalaya region results in strong to major earthquakes.What year was the 7.8 earthquake in Nepal?A magnitude 7.8 earthquake struck Nepal on April 25, 2015, resulting in significant destruction and loss of life.What was the worst earthquake in Nepal?The worst earthquake in Nepal’s history occurred on April 25, 2015. It measured magnitude 7.8 and was followed by a second tremor 17 days later, resulting in a total of 9,000 casualties.What does a 7.8 earthquake mean?A 7.8-magnitude earthquake is significantly stronger than a 5.0-magnitude quake. In terms of energy release, a 7.0 earthquake is approximately 1,000 times stronger than a 5.0 earthquake. It creates more explosive energy than the atomic bomb dropped on Hiroshima.Which area of Nepal is prone to earthquakes?The entire area of Nepal, being centrally located in the Hindu-Kush-Himalaya region, is highly prone to earthquakes. However, Western Nepal is specifically identified as under the threat of bigger earthquakes, with no major earthquake recorded in the area for the last 520 years.Are there volcanoes in Nepal?No, there are no active volcanoes in Nepal. The Himalayas, despite being a tectonic collision zone, do not have volcanic activity.What are the 4 rocks found in Nepal?The geological study carried out in Nepal has identified four main rock types in the area – quartzite, phyllite, metasandstone, and psammatic phyllite. Additionally, schist and gneiss are present in some parts of the region.Is Mt Everest on a fault line?Yes, two large-scale north-dipping, low-angle normal faults cut the Everest massif at the top of the High Himalayan slab in Nepal. One of these faults, the Qomolangma Detachment, runs along the north slope of Everest from above the ‘Yellow Band’ at around 8500 m on the Southwest Face down to the Rongbuk glacier.How does Nepal prepare for earthquakes?Nepal has been taking measures to prepare and mitigate the impact of earthquakes. Building codes have been updated to require seismic resistance in construction, and efforts have been

Highlights•Precursory tidal triggering and b value was identified before M5 intraplate earthquakes.•The b value keeps a long-term low value, indicating a near-critical stress state.•Remote triggering is consistent with the tidal response and the b value variation.•Geothermal fluid may play a role in the triggering mechanism.AbstractRecent studies have suggested that tidal triggering may preferentially occur when a region is critically stressed, and that tidal stresses provide a potential tool for forecasting earthquakes. Most tidally triggered precursors before large earthquakes are found in subduction zones. We examined tidal triggering of earthquakes near the intracontinental Gaoligong Shear Zone, which is also a geothermally active region. We observed statistically significant correlations between tidally induced stresses and earthquake times, which only appeared approximately two years before the 2011 Tengchong Mw 5.1 and 5.0 earthquakes. The Schuster spectrum shows two peaks at ∼0.5 and ∼1.0 days related to the tidal period. The tidal phase distribution in the pre-mainshock time period shows that most earthquakes occur during phases of positive tidal shear stress and dilatancy strain. Our findings provide a typical case of tidal triggering of earthquake precursors in a continental setting. The stress state can be inferred using the Gutenberg–Richter b value, which characterizes the relative proportion between small and large earthquakes and correlates negatively with differential stress. We investigated the temporal changes of the b value and found that it retains a long-term low value but has a prominent short-term decline prior to mainshocks. The coincidence of low Schuster probability ps with a low b