A joint inversion of receiver function and Rayleigh wave phase velocity dispersion data to estimate crustal structure in West Antarctica

first_imgWe determine crustal shear-wave velocity structure and crustal thickness at recently deployed seismic stations across West Antarctica, using a joint inversion of receiver functions and fundamental mode Rayleigh wave phase velocity dispersion. The stations are from both the UK Antarctic Network (UKANET) and Polar Earth Observing Network/Antarctic Network (POLENET/ANET). The former include, for the first time, 4 stations along the spine of the Antarctic Peninsula, 3 in the Ellsworth Land and 5 stations in the vicinity of the Pine Island Rift. Within the West Antarctic Rift System (WARS) we model a crustal thickness range of 18-28 km, and show that the thinnest crust (∼18 km) is in the vicinity of the Byrd Subglacial Basin and Bentley Subglacial Trench. In these regions we also find the highest ratio of fast (Vs = 4.0-4.3 km/s) (likely mafic) lower crust to felsic/intermediate upper crust. The thickest mafic lower crust we model is in Ellsworth Land, a critical area for constraining the eastern limits of the WARS. Although we find thinner crust in this region (∼30 km) than in the neighbouring Antarctic Peninsula and Haag-Ellsworth Whitmore block (HEW), the Ellsworth Land crust has not undergone as much extension as the central WARS. This suggests that the WARS does not link with the Weddell Sea Rift System through Ellsworth Land, and instead has progressed during its formation towards the Bellingshausen and Amundsen Sea Embayments. We also find that the thin WARS crust extends towards the Pine Island Rift, suggesting that the boundary between the WARS and the Thurston Island block lies in this region, ∼200 km north of its previously accepted position. The thickest crust (38-40 km) we model in this study is in the Ellsworth Mountain section of the HEW block. We find thinner crust (30-33 km) in the Whitmore Mountains and Haag Nunatak sectors of the HEW, consistent with the composite nature of the block. In the Antarctic Peninsula we find a crustal thickness range of 30-38 km and a likely dominantly felsic/intermediate crustal composition. By forward modelling high frequency receiver functions we also assess if any thick, low velocity subglacial sediment accumulations are present, and find a 0.1-0.8 km thick layer at 10 stations within the WARS, Thurston Island and Ellsworth Land. We suggest that these units of subglacial sediment could provide a source region for the soft basal till layers found beneath numerous outlet glaciers, and may act to accelerate ice flow.last_img read more

Dixie State Baseball With Four Home Games This Weekend

first_imgThe Trailblazers’ Rocky Mountain Athletic Conference brethren, the Colorado Mesa Mavericks, will also compete at Bruce Hurst Field this weekend. They will then host the Cal State Los Angeles Golden Eagles Friday at 3:00 pm and again Saturday at 3:00 pm. February 7, 2019 /Sports News – Local Dixie State Baseball With Four Home Games This Weekend Written by Dixie State is 5-1 all-time against Northwest Nazarene and Thursday afternoon’s game is the first match-up in the series since 2016. This is Dixie State and Cal State-Los Angeles’ first meeting since 2014. Saturday, the Trailblazers will go with right-handed redshirt senior Kaivon Kealoha. FacebookTwitterLinkedInEmailST. GEORGE, Utah-Thursday afternoon, Dixie State baseball commences a span of four games in three days at Bruce Hurst Field. The Trailblazers lead the Golden Eagles 9-3 all-time and have won five straight games as well as eight of the last nine in the series. Thursday, Dixie State will trot out reigning RMAC pitcher of the week Jayden Murray. In the first Friday game, the Trailblazers will go with redshirt junior right-handed pitcher Preston Hannay in his season debut. Dixie State will go with sophomore left-handed pitcher Jack Gonzales in Friday’s second game. The 3-1 Trailblazers will host Northwest Nazarene Thursday at 4:00 pm and have another game against the Nighthawks Friday at 11:30 am. Tags: Bruce Hurst Field/Cal State Los Angeles Golden Eagles/Dixie State Baseball/Jack Gonzales/Jayden Murray/Kaivon Kealoha/Northwest Nazarene Nighthawks/Preston Hannay Brad Jameslast_img read more

Thunderbird Show Park Cancels 2021 Nations Cup

first_imgA member of the North and Central American and Caribbean division of the Longines FEI Jumping Nations Cup™ series, Thunderbird Show Park has announced the cancellation of the 2021 CSIO5* Longines FEI Jumping Nations Cup™ of Canada, originally scheduled to run during the venue’s Odlum Brown BC Open tournament on 6 June 2021.The cancellation comes as a result of a Provincial Health Authority announcement made 19 April, extending British Columbia’s current health order in response to the ongoing global pandemic.“With the announcement from the Provincial Health Authority extending and adding to the current restrictions, it is with great regret we are unable to host the Canadian Premier and Odlum Brown BC Open,” said Chris Pack, President of Thunderbird Show Park. “Instead, we’ll pivot and plan for a 3-week tournament series in June and July, adding an extra week before our West Coast Classic and Western Family tournaments, and a three-week tournament series as planned in August.”With five decades of history hosting high performance sport, Thunderbird Show Park, located in Langley, BC, hosted its first Nations Cup event in 2016 and its first CSIO5* in 2018. By the end of that year, the venue was awarded the Longines FEI Jumping Nations Cup™ for a three-year term. The most historic team event in show jumping, the Longines FEI Jumping Nations Cup™ of Canada has provided some memorable moments in Langley, among them a hometown victory for Team Canada in 2019. That team consisted of Lisa Carlsen, Mario Deslauriers, Nicole Walker and Tiffany Foster, who grew up showing at tbird.“We’d like to thank Longines as well as the BC Open’s title sponsor Odlum Brown for their continued support of our venue,” Pack said. “The BC Open and the Longines FEI Jumping Nations Cup of Canada have become highlight events on our calendar at tbird, and we all greatly look forward to their return in 2022.”Thunderbird Show Park has not hosted competition since the venue’s CSI2* Harvest Welcome in October 2020, which was the only FEI competition in Canada last year. The venue plans to add events to its calendar later this summer, pending further easing of restrictions.“We know this is the right choice for our community, and we appreciate everyone’s continued support,” Pack said. “We will release more details about entering the new third week in July in the near future.”For more information on Thunderbird Show Park, including the Longines FEI Jumping Nations Cup™ of Canada, visit tbird.ca. Tags: Thunderbird Show Park, Odlum Brown BC Open, tbird, Canadian Premier, CSIO5* Longines FEI Jumping Nations Cup™ of Canada, Provincial Health Authority, We’ll send you our regular newsletter and include you in our monthly giveaways. PLUS, you’ll receive our exclusive Rider Fitness digital edition with 15 exercises for more effective riding. Horse Sport Enews Email* More from News:MARS Bromont CCI Announces Requirements For US-Based RidersThe first set of requirements to allow American athletes and support teams to enter Canada for the June 2-6 competition have been released.Canadian Eventer Jessica Phoenix Reaches the 100 CCI4*-S MarkPhoenix achieved the milestone while riding Pavarotti at the inaugural 2021 CCI4*-S at the Land Rover Kentucky Three-Day Event.Tribunal Satisfied That Kocher Made Prolonged Use of Electric SpursAs well as horse abuse, the US rider is found to have brought the sport into disrepute and committed criminal acts under Swiss law.Washington International Horse Show Returns to TryonTIEC will again provide the venue for the WIHS Oct. 26-31 with a full schedule of hunter, jumper and equitation classes. Subscribe to the Horse Sport newsletter and get an exclusive bonus digital edition! SIGN UP last_img read more

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NICIL’s financial performance reflective of Govt’s mismanagement – PPP/C

first_imgIn observing recent media reports about the poor financial performance of the National Industrial and Commercial Investments Limited (NICIL), the Opposition People’s Progressive Party/Civic (PPP/C) has criticised Government, saying the agency’s performance is reflective of two years of mismanagement.The PPP/C said in a statement that under its leadership, the Privatisation Unit of NICIL contributed tens of billions of dollars to the Treasury from dividends and privatisation receipts. However, under the coalition Government, NICIL’s finances have been allowed to dwindle due to grave mismanagement and neglect. It was also noted that legal proceedings involving billions of dollars against the A Partnership for National Unity (APNU)/Alliance For Change (AFC) are not being actively pursued.“Valuable real estate that could have been sold or rented are poorly managed and are allowed to deteriorate,” the Opposition PPP further pointed out.The Party said given the billions of dollars NICIL contributed to the Treasury, it is still to be known, “How much has been transferred under APNU and where the audited accounts are.”NICIL produced and laid in Parliament clean audit reports, for both NICIL and its subsidiaries, up to the time that the PPP left Government. As such, the Party is now questioning what APNU/AFC has done.The PPP recalled that when former Auditor General Anand Goolsarran’s report on NICIL was handed back to him, it contained over 100 plus pages of responses. However, the APNU/AFC has never published these responses or similar type responses to the many forensic audits.It was however noted that the Privatisation Unit has published details on all its transactions, including details relating to transparency and transaction values.Under the PPP the Party said, NICIL made economic contributions and investments and loss-making entities were restructured, privatised or improved and NICIL found ways to ensure that its assets were properly managed and contributing financial and economic returns.“Under the PPP, NICIL was not handed a golden spoon – it was innovative and created substantial value; it investments were not white elephants like the D’Urban Park project,” the PPP statement said.The Opposition party said if NICIL’s investments in the Berbice Bridge, Marriott or Skeldon Energy have not performed in accordance with its feasibilities, there is a clear connection with how the APNU/AFC policy decisions, incompetence, or action, have directly contributed to any sub-par performance.“The PPP calls on these matters to be debated in the National Assembly and for APNU to provide all relevant information,” the statement added.Saving bauxiteThe Opposition said NICIL/PU was relentless in saving the bauxite industry, where hundreds of millions of dollars were injected to maintain the operations in Region 10 (Upper Demerara-Berbice) from Linmine, Bermine and then Aroaima Bauxite.Even after privatisation, from 2004, the now acting Chief Executive Officer of NICIL, Horace James, and a large secretariat, were maintained and funded by NICIL to ensure that all matters relating to Linmine were fully addressed and that maximum development was achieved.“No one mentions these today. Government similarly injected billions of dollars for decades. Linden residents receive electricity at highly subsidised rates today relative to the consumers who pay GPL for power, including power generated by SEI of almost 90 billion KWH,” the PPP noted.The party said for decades monies were used for support; saving jobs and keeping bauxite alive.Despite the Marriott, Berbice Bridge and Skeldon Energy Inc as described as “blunders” by NICIL, the PPP/C said Marriott today provides many jobs and is the largest taxpayer in the hospitality sector.“It is no secret that the Marriott project was handicapped when the APNU/AFC Government shelved completion of the casino that was going to be operated by Marriott; funding was already arranged from Republic Bank but it was delayed by court proceedings filed by an APNU Member of Parliament.”The party said shortly after the APNU/AFC took office, the coalition Government immediately withdrew the legal proceedings and signed the debenture – yet the monies were never utilised to complete the casino and reimburse NICIL for its investment.No blunderIn respect of Skeldon Energy Inc (SEI), the Guyana Suagr Corporation (GuySuCo) is yet to transfer the energy assets, which have been held up by its Chairman Clive Thomas. The Opposition party believes therefore that GuySuCo should pay back the monies advanced by GPL and NICIL, since Clive Thomas has breached this agreement.A few months ago, SEI Chairman Lloyd Rose exposed that GuySuCo had never transferred the assets that GPL and NICIL had paid for. The PPP/C said that means that the US$20 million plus in funds paid by GPL and GuySuCo, have benefited the 50,000 persons that are affected by GuySuCo.In making reference to the Berbice Bridge Project, the PPP/C said when it left office in May 2015, NICIL had no investments in the Berbice Bridge. However the coalition Government attacked the Berbice Bridge project and breached the agreements with the many Private Sector investors.The Party also thinks Government was simply playing politics when it reduced tolls, especially since in less than one year, it passed on massive tax increases and fees including the Demerara Bridge toll increase, and attempted to push through the Parking Meter Contract.last_img read more