Monday, 2 June 2014

Magnitude 4.5 Earthquake on the north coast of the Dominican Republic.

The United States Geological Survey recorded a Magnitude 4.5 Earthquake at a depth of 10 km on the north coast of the Dominican Republic, slightly after 9.00 pm local time on Sunday 1 June 2014 (slightly after 1.00 am on Monday 2 June, GMT). There are no reports of any damage or injuries relating to this event, though it was felt locally.

The approximate location of the 1 June 2014 Dominican Republic Earthquake. Google Maps.

The Dominican Republic forms the eastern part of the island of La Hispaniola, in the Greater Antilles.  The island has a complex geological structure, with parts of it lying on three different tectonic plates, and two plate margins running east-to-west across the island.

The northernmost part of the island lies on the North American Plate. This is divided from the Gonâve Microplate by the Septentrional Fault Zone, which runs through Rio San Juan, along the north coast of the Dominican Republic and Haiti, then across the Windward Passage and along the south coast of Cuba. The Gonâve Microplate is moving east relative to the North American Plate, pushed by the Mid-Cayman Spreading centre to the west of Jamaica.

To the south the Gonâve Microplate is separated from the Caribbean Plate by the Enriquilo-Plantain Garden Fault Zone, which runs across Southern Haiti and the Dominican Republic. To the west the fault runs through central Jamaica. The Caribbean Plate is rotating clockwise, effectively moving east relative to the Gonâve Microplate.

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The United States Geological Survey recorded a Magnitude 5.1...




The United States Geological Survey recorded a Magnitude 6.1...




The United States Geological Survey recorded a Magnitude 3.4...


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Sunday, 1 June 2014

African Tigerfish observed snatching Barn Swallows from the air.

A variety of Fish are known to occasionally take Birds as prey. Sharks and other large carnivorous marine Fish will frequently feed on Seabirds on the water surface, and in freshwater aquatic environments Bass, Eels, Piranhas, Pike and Catfish have all been observed to take avian prey, either from the water surface, from land close to the water, or from overhanging vegetation. Uniquely, the African Tigerfish (Hydrocynus spp.) has a reputation for taking Birds on the wing; this has been reported by numerous authors from 1945 onwards, but these reports have all been based upon anecdotal evidence, never witnessed by the authors themselves as part of an organized study.

In a paper published in the Journal of Fish Biology on 19 December 2013, Gordon O’Brien, Francois Jacobs, S Evans and Nico Smit of the Water Research Group (Ecology) at the Unit of Environmental Sciences and Management at North-West University report direct observation of feeding on Birds in flight by a population of the African Tigerfish (Hydrocynus vittaltus) at Schroda Dam, an artificial lake in the Mapungubwe National Park in Limpopo Province, South Africa.

The Shroda Dam was constructed in 1993 as a storage lake, and covers 4 100 000 m³. The African Tigerfish (Hydrocynus vittaltus) was deliberately introduced to the lake in 2003. The lake is considered to be nutrient poor compared to typical Hydrocynus vittaltus environments, and the Fish spend a higher proportion of their time foraging than has been reported in other populations. However they typically avoid open waters during the hours of daylight, probably due to the presence of the African Fish Eagle (Haliaeetus vocifer).

In February 2011 a number of Fish that had been radio-tagged as part of a study into their behaviour were observed to be breaking this taboo, and becoming highly active in open waters during the mid-morning. Direct observation of the lake revealed that the fish were striking at Barn Swallows (Hirundo rustica), a migratory Bird which visits the lake seasonally, both drinking on the wing and hunting small Insects close to the water surface. None of the radio-tagged Fish was observed capturing a Barn Swallow, though other Fish were on numerous occasions, and some instances were filmed with a hand-held camcorder.

The Tigerfish employed two different strategies when hunting Birds. Some Fish chased the Birds at the surface prior to striking, while others remained deeper in the water and suddenly lunged upwards at Birds. This second hunting behaviour was more successful, capturing a Bird on roughly one-in-three attempts (as opposed to about one-in-seven for the chase and lunge technique), but involved compensating for light refraction at the water surface, something not all the fish appeared able to do.

Avivorous behavioural strategies adopted by Hydrocynus vittatus in the Schroda Dam man-made lake. (a) Flight path of the prey Hirundo rustica, (b) surface pursuit strategy of Hydrocynus vittatus to overcome surface image shift due to light refraction (angle θ) and (c) direct aerial strikes by adult Hydrocynus vittatus that compensate for the image shift (not drawn to scale). O’Bien et al. (2013).

Since the Shroda Dam is a new environment for the Tigerfish, and fast-moving Barn Swallows are a fairly difficult Bird to target from the water, O’Brien et al. suggest that this behaviour is likely to be quite widespread in Tigerfish, and that it would be worth investigating at other localities.

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Catfish (Siluriformes) are a large, diverse group of freshwater and shallow marine Fish, found on every continent except Antarctica. They are primarily benthic detrivores, but show a very wide rage of trophic adaptations. They show the widest range of sizes of any group of Boney Fishes, with the smallest species...





Piranhas are carnivorous Characid Fish from the Amazon river basin with a reputation for stripping large animals to the bone in seconds. While this reputation is unquestionably exaggerated, Piranhas are still formidable predators, capable of delivering powerful bites and tackling large prey. In the Late Miocene South America was home to a much larger fish, Megapiranha paranensis, which is thought to have...




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Asteroid 2014 KM22 passes the Earth.

Asteroid 2014 KM22 passes by the Earth at a distance of 7 187 000 km (18.62 times the average distance between the Earth and the Moon) slightly before 8.35 am GMT on Wednesday 28 May 2014. There was no danger of the asteroid hitting us, and had it done so it would have presented little threat. 2014 KM22 is calculated to have an equivalent diameter of 9-28 m (i.e. a spherical body with the same volume would be 9-28 m in diameter), and an object of this size would be expected to break up in the Earth's atmosphere between 33 km and 17 km above the ground, with only fragmentary material reaching the planet's surface.

The calculated orbit of 2014 KM22. JPL Small Body Database Browser.

2014 KM22 was discovered on 20 May 2014 (eight days before its closest approach to the Earth) by the University of Hawaii's PANSTARRS telescope on Mount Haleakala. The designation 2014 KM22 implies that it was the 563rd asteroid (asteroid M22) discovered in the second half of May 2014 (period 2014 K).

While 2014 KM22 occasionally comes near to the Earth, it does not actually cross our orbital path. It has an elliptical 1031 day orbit, that takes it from 1.06 AU from the Sun (1.06 times the distance at which the Earth orbits the Sun), slightly outside our orbit, to 2.15 AU from the Sun, (2.15 times the distance at which the Earth orbits the Sun, considerably more than the distance at which the planet Mars orbits the Sun). As a Near Earth Object that remains strictly outside the orbit of the Earth it is classed as an Amor Family Asteroid.


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Asteroid 2014 KC45 passed by the Earth at a distance of 88 260 km (23% of the distance between the Earth and the Moon), at about 8.10...


 Asteroid 2014 JE15 passes the Earth.


Asteroid 2014 JE15 passed by the Earth at a distance of 15 810 000 km (over 40 times the average distance between the Earth and the...



 Faye's Comet reaches its perihelion.

Faye's Comet (Comet 4P/Faye) reached it's perihelion (the closest point in its orbit to the Sun) on 29 May 2014, for the first time in seven-and-a-half years. It presents no danger to the Earth, as it never comes within the orbit of Mars, and was not easily visible on this...



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At least six dead following Guatemala landslide.

Six people are known to have died, three more are missing and seven are being treated for a variety of injuries following a landslide in the village of Joya Grande in the Department of Huehuetenango in northwest Guatemala on Friday 30 May 2014. The landslide buried one home, containing two families, and damaged a further 17.

The village of Joya Grande in the Department of Huehuetenango in northwest Guatemala following the 30 May 2014 landslide. Rhn.

The incident is said to have happened after about 5 hours of continuous heavy rainfall. Landslides are a common problem after severe weather events, as excess pore water pressure can overcome cohesion in soil and sediments, allowing them to flow like liquids. Approximately 90% of all landslides are caused by heavy rainfall. Guatemala experiences two seasons annually, with a dry season that runs from December to April and a rainy season that runs from May to November. Typically it receives about 400 mm of rain per month in the rainy season.

The approximate location of the 30 May 2014 Joya Grande landslide. Google Maps.

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Does the Çatalhöyük Mural depict a volcanic eruption?

Çatalhöyük is a Neolithic settlement in central Anatolia discovered in the 1960s and dated to about 6600 BC. It is considered to be one of the oldest known urban communities, pre-dating the earliest settlements in Egypt and Sumeria by over a thousand years, and providing key insights into civilization in the Middle East during the transition from semi-nomadic hunter-gatherer to settled agricultural communities. One of the more remarkable finds from Çatalhöyük is a wall painting known as the Çatalhöyük Mural, which either (depending on interpretation) depicts a volcanic eruption with a map of a village in the foreground or the skin of a Leopard with the limbs removed. If the mural is a map then it predates any other known map or depiction of a landscape by several thousand years, making the claim particularly remarkable.

The Çatalhöyük Mural  as preserved in the Museum of Anatolian CivilizationsAlamy.

Proponents of the map theory have argued that the village depicted in the map could be Çatalhöyük itself, Aşıklı Höyük, a slightly older settlement about 200 km to the northeast or Musular, which is close to Aşıklı Höyük and roughly contemporaneous with the earliest phases of settlement at Çatalhöyük. The volcano has variously been interpreted as Hasan Dağı, Melendiz Dag or Karapinar. None of these volcanoes would have been likely to produce an eruption visible from Çatalhöyük, but an eruption on Hasan Dağı would be visible from Aşıklı Höyük or Musular, and the civilization at Çatalhöyük is known to have used tools made from volcanic obsidian, which implies they were trading with communities closer to the volcanoes.

In a paper published in the journal PLoS One on 8 January 2014, Axel Schmitt of the Department of Earth and Space Sciences at the University of California Los Angeles, Martin Danišík of Earth and Ocean Sciences at the University of Waikato, Erkan Aydar of ATERRA R&D, Erdal Şen and İnan Ulusoy of the Department of Geological Engineering at Hacettepe University and Oscar Lovera, also of the Department of Earth and Space Sciences at the University of California Los Angeles, describe the results of an attempt to determine the plausibility of the map interpretation of the Çatalhöyük Mural by dating volcanic deposits at Hasan Dağı, the most likely site of a volcanic eruption.

(A) Location of the Çatalhöyük Neolithic site, Hasan Dağı, and other Holocene volcanoes in Anatolia. Overview map with inset showing map of sampling locations. Hasan Dağı volcano and sampling location of pumice dated in this study.  (C) Black-and-white rendering of Çatalhöyük wall painting interpreted to show the twin-peaks of erupting Hasan Dağı and closely spaced buildings in the lower level. An alternative interpretation is that of a leopard skin underlain by a geometric pattern. (D) Three dimensional rendering of Hasan Dağı twin peaks volcano as seen from the north. Schmitt et al. (2014).

Hasan Dağı is a composite stratovolcano (a stratovolcano is a cone-shaped volcano, a composite stratovolcano two or more cones fused together) with two peaks at 3253 and 3069 m connected by a central saddle, and known as Big and Small Mount Hasan. It is a distinctive landmark, rising over 1000 m above the surrounding plains. Schmitt et al. reasoned that if the Çatalhöyük Mural does in fact depict an eruption on Hasan Dağı, then the mountain must have erupted either during, or slightly before, the time Çatalhöyük was occupied, reasoning that a significant eruption might have been remembered for a generation or so, but ruling out oral histories lasting thousands of years.

In order to do this Schmitt et al. collected pumice samples from unconsolidated deposits at two locations, on the summit and southwest flank of Big Hasan Dağı peak. These samples were crushed and sieved in order to get zircon mineral samples that were then analysed for uranium-thorium/helium ratios using Secondary Ionization Mass Spectrometry. Zircon is a mineral formed by the crystallization of cooling lavas. When it forms it contains uranium which decays into thorium and helium at a known rate. Since helium will not have been present in the original lava, it is possible to calculate the age of a zircon crystal from the ratio between the three elements.

(A) Location and field pictures for andesitic pumice deposit (sample HD) collected near the summit of Hasan Dağı. Astronaut photography of Hasan Dağı summit showing the location of sample HD (red dot) outside the crater rim. Image courtesy of the Image Science & Analysis Laboratory, NASA Johnson Space Center. (B) Field scene of HD sampling location looking North. (C) Light coloured fall-out deposit abutting altered lava with geologist for scale. (D) Close-up of pumice veneer at HD sampling location with camera pouch (center left) for scale. Schmitt et al. (2014).

Schmitt et al. obtained ages of 8970 for the summit sample and 28 900 for the flank sample (i.e. ~6960 BC and ~27 000 BC).  This places the eruption that produced the flank samples firmly in the Pleistocene, clearly too old to have been observed by the makers of the Çatalhöyük Mural. However the age for the summit sample (~6960 BC) is close enough to the estimated time for the first occupation of Çatalhöyük (~6600 BC) that the two events are effectively indistinguishable (i.e. the margins of error on the two dates overlap), making it quite possible that the Çatalhöyük Mural does indeed depict an eruption on Hasan Dağı. 

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The United States Geological Survey recorded a Magnitude 6.9 Earthquake at a depth of 10 km beneath the north Aegean Sea, close to the Greek Islands of Samothraki and Lemnos and the Turkish Island of Gokceada, at about 11.25 am local time (9.25 am GMT) on Saturday 24 May 2014. Minor damage to buildings and several injuries have been directly attributed to the quake...




The production of copper goods in the Middle East is thought to date from around 4500-3800 BC, when the Ghassulian culture of the...




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A new species of Cockroach Wasp from Thailand.

Cockroach Wasps (Ampulicidae) are a group of Digger Wasps (Aculeata) which specialize in the hunting of Cockroach prey. Some of these Wasps are large conspicuous Insects with metallic colourings, others are smaller and duller with Ant-mimicking colouration. Cockroach Wasps are largely ground hunters, they have long legs to chase and leap on their prey, rather than hunting on the wing. They subdue their prey by stinging them; however this sting appears to render the Cockroach helpless rather than paralyzing it, the stung Cockroach allowing itself to be led meekly by one antennae to the Wasps nest, where the Wasp lays an egg within the living Cockroach’s body and buries it to be consumed by the Wasp larvae.

In a paper published in the journal PLoS One on 22 April 2014, Michael Ohl, Volker Lohrmann, Laura Breitkreuz, Lukas Kirschey and Stefanie Krause of the Museum für Naturkunde at the Leibniz-Institut für Evolutions- und Biodiversitätsforschung, describe a new species of Cockroach Wasp in the genus Ampulex from the Khâo Kho National Park in Phetchabun Province, Thailand.

The new Wasp’s name was chosen by popular ballot as part of a citizen science project at the Museum für Naturkunde, itself part of a wider ‘Long Night of the Museums’ in Berlin, designed to increase public awareness of and involvement in museum projects. 

Four potential specific names were chosen for the new Wasp and placed on ballot papers available on request to followers of the museum on Facebook or Twitter. These were Ampulex bicolor, meaning ‘two coloured’, a reference to the Wasp’s colouration; Ampulex mon, a reference to the ancient Mon people of Thailand (ancient peoples have long been used as proxies for places in taxonomy, as classically trained eighteenth and nineteenth century taxonomists sought names from associated with places from Roman or Greek literature); Ampulex dementor, a reference to the Dementors or Soul-suckers of JK Rowling’s Harry Potter novels, which guarded the wizard-prison of Azkerban, and which sucked all happiness and hope from their victims, a method thought similar to the attacks of Cockroach Wasps on Cockroaches, which appear to strip the Cockroaches of any will to escape; and Ampulex plagiator, meaning ‘plagiarist’ a reference to the Wasp’s Ant-mimicking behaviour.

On the night of the event 272 of the 300 ballot papers issued returned, with Ampulex dementor gaining 105 votes, ahead of Ampulex plagiator (90), Ampulex bicolor (41) and Ampulex mon (36). The new Wasp was therefore named Ampulex dementor, or the Soul-sucking Cockroach Wasp.

Ampulex dementor is a 9.6-10.9 mm red and black Ant-mimicking Cockroach Wasp with clouded forewings and long legs adapted to running and jumping behaviour. The species is described from two female specimens captured in a pit trap in mixed deciduous forest at an altitude of 524 m within the Khâo Kho National Park in Phetchabun Province, Thailand, by S. Chachumnan & S. Singtong of the Queen Sirikit Botanic Garden in Chiang Mai.

Ampulex dementor, the Soul-sucking Cockroach Wasp, in ventral view. B. Schurian in Ohl et al. (2014).

Ohl et al. deem their public engagement project to have been a success due to the high proportion of ballots returned, though they note that members of the public willing to sign up for a night-time event at a natural history museum may be considerably more engaged with the science of taxonomy than the general population to start with. 

They could find no similar project where members of the public had been asked to participate in formal taxonomic naming, though they did not a previous project in which The Guardian newspaper, Natural England and the Oxford University Museum of Natural History were asked to submit common English names for the endangered click-beetle, Megapenthes lugens, which were then subjected to a panel of expert judges, resulting in the name ‘Queen’s Executioner Beetle’ being chosen. This project resulted in over 3000 names being submitted, though it was largely an exercise in raising public awareness of a conservation issue rather than taxonomy.

Megapenthes lugens, the Queen’s Executioner Beetle. Stanislav Krejčik/Meloidae.

Ohl et al. also noted the 2005 project in which the right to name a new species of Titi Monkey discovered in the Madidi National Park in Bolivia was auctioned online, resulting in the Monkey gaining the name Callicebus aureipalatii, the Golden Palace Titi Monkey, after a successful US$650 000 bid by the Golden Palace online casino, the money going to the Bolivian Park Service to run the Madidi National Park. This project has inspired several follow-up taxonomic name auctions, however while these projects are a useful source of funds to taxonomists and conservation projects, they do little to engage the wider public, as they seek primarily to attract the attention of wealthy individuals or organizations.

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Braconid Wasps are parasitoid Wasps (i.e. Wasps whose larvae mature inside the living bodies of other insects, which generally die as a result) related to the more familiar Ichneumon Wasps, but much smaller. They have a formidable appearance, but are in fact stingless, making them harmless to non-host species. There are about... 






Helorid Wasps are small, black, parasiotoid Wasps, with larvae that develop inside the bodies of the young of Green Lacewings. The...


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Magnitude 4.3 Earthquake in the Karlovy Vary Region of the Czech Republic.

The United States Geological Survey recorded a Magnitude 4.3 Earthquake at a depth of 10 km in the Karlovy Vary Region of the Czech Republic, close to the border with Germany, slightly after 12.35 pm local time (slightly after 10.35 am GMT) on Saturday 31 May 2014. There are no reports of any damage or casualties associated with this event, though it was felt as far away as Prague and Leipzig.

The approximate location of the 31 May 2014 Karlovy Vary Earthquake. Google Maps.

The Czech is in north-central Europe, an area not noted for its Earthquakes, but not completely immune either. Like other areas where Earthquakes are uncommon, it is seldom possible to give a precise cause for Czech Earthquakes, with both probably being the result of more than one source of tectonic pressure. The strongest source of tectonic stress in southern the Czech Republic is the impact of Africa with Europe, far to the south. This is causing uplift and folding in the Alpine region of Central Europe, and exert pressure on the rocks further to the north. There are also areas of minor tectonic spreading beneath the Rhine Valley and North Sea, both of which cause stress over a wide area. Finally there is glacial rebound; until about 10 000 years ago much of northern and upland Europe was covered by a thick layer of glacial ice, pushing the rocks of the lithosphere down into the underlying mantle. This ice is now gone, and the rocks are slowly springing back into place, causing occasional Earthquakes in the process.

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The Zentralanstalt für Meteorologie und Geodynamik recorded a...




The Zentralanstalt für Meteorologie und Geodynamik recorded a...



On Friday 6 April 2012 slightly after 8.40 am local time (slightly after 6.40 am GMT) hit the Silesian town of Lubin in southwest Poland. The quake was measured as having a magnitude of 4.4 on the Richter Scale, and occurring at a depth of 4.9 km by the United States Geological Survey. There are no reports of any casualties or serious damage at this time.





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