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Very strong M7.3 earthquake hits Venezuela at intermediate depth
A very strong earthquake registered by the USGS as M7.3 hit near the coast of Sucre, Venezuela at 21:31 UTC on August 21, 2018. The agency is reporting a depth of 123.2 km (76.5 km). EMSC is reporting M7.3 at a depth of 112 km (69.6 miles). According to the USGS, the epicenter was located  20.9 km (13.0 miles) NNW of Yaguaraparo, 38.4 km (23.9 miles) ENE of Carúpano (population 112 082), 69.4 km (43.1 miles) WNW of Güiria (population 40 000), 107.6 km (66.9 miles) ESE Porlamar (population 87 120) and 109.1 km (67.8 miles) ESE of La Asunción (population  35 084), Venezuela. There are 560 000 people living within 100 km (62 miles). Based on all available data, there is no tsunami threat, PTWC said. Some 52 000 people are estimated to have felt very strong shaking, 2 089 000 strong, 2 587 000 moderate and 3 928 000 light. Buildings were evacuated in the capital Caracas and people fled homes. Shaking was felt as far away as …

Solar activity cycle falls to the bottom 1.5 years earlier than expected

Solar activity cycle falls to the bottom 1.5 years earlier than expected


According to the Laboratory for X-ray Solar Astronomy of the PN Lebedev Physical Institute in Russia, the solar activity cycle has, by all indications, practically reached its minimum 1.5 years ahead of expected time. Given that the previous solar maximum in 2012 was one of the weakest in the last century, it is possible, that we are now waiting for an earlier and substantially more "severe" minimum of the cycle. 
There were no magnetic storms and field disturbances observed in the last two months related to solar activity, the laboratory said in a news release. Thus, space weather in the vicinity of our planet is increasingly losing its connection with the Sun, which by all indications practically fell to the bottom of the next minimum of the 11-year solar cycle 1.5 years earlier than expected.
At 5.7, the average monthly number of sunspots (one of the main indicators of the level of solar activity) reached a minimum value for the last 8 years of observations in November 2017. The last time the lower value was recorded in the last decade was in August 2009.
Although the decrease in the number of sunspots on the Sun is normal for our star, in this case, it occurs unexpectedly early, the laboratory wrote in an earlier release."Up to the minimum point of the solar cycle, there are still about 15 months, and usually at this stage, the sunspot activity of the Sun is higher." 
The average number of sunspots in September was 43, it dropped to 13 in October and to 5 in November.
"It is possible that this indicates a faster approximation of the next solar minimum than was expected. Such cases, when intervals between solar minima were reduced from 11 to 10 and even 9 years, are known in the history of astronomy, but occurred quite a long time ago - about 200 years - called the Dalton minimum. 
400 years of sunspot observations
"Given that the previous solar maximum in 2012 was one of the weakest in the last century, it is possible, that we are now waiting for an earlier and substantially more "severe" minimum of the cycle. 
"If so, it is impossible to exclude that solar activity is now falling to the bottom of a 100-year or even 1000-year cycle. Although the question of the presence of such global recessions in the Sun is still debatable, radiocarbon analysis of rocks and plants provides much evidence of the existence of such changes in the past."
Featured image credit: NASA/SDO (December 20, 2017)

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