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Possibility of further volcanic eruptions in Tonga can't be excluded, says expert******

The volcano in Tonga might go quiet after eruption, but the possibility of further explosions can't be excluded, a British expert on volcanoes said Tuesday.。

As rescue teams continued to head to the collection of islands in the Pacific Ocean, Professor Mike Burton from the University of Manchester told Xinhua in an interview that "Because the volcano is basically submarine, we don't know what's going on."

"Almost anything could happen, and we just have to wait and see at this point," said the volcanologist at the university's Department of Earth and Environmental Sciences.。

The eruption on Saturday propelled thousands of tons of ash high into the atmosphere and set off a tsunami. Many of the roughly 170 islands around Tonga are covered with a thick layer of volcanic ash.。

The Tonga volcano, hundreds of kilometers underwater, and around 65 kilometers from Tonga's capital, is something of a mystery, said Burton, who tries to understand when a volcano might erupt by measuring the flux and composition of the often deadly poisonous gases created by volcanic activity.。

"The latest eruption which occurred on January 15 is possibly the biggest eruption we've seen for the last 30 or 40 years. I say possibly, because there are still some question marks over exactly what happened," he said.。

"It appears to be contradictory in some ways. In one sense, there's a sign that this was a very powerful, very big explosion, as it appeared to have gone up very high into the atmosphere, up to about 35 kilometers in height," Burton said.。

"To get that high in the atmosphere, you normally need a huge amount of material to erupt. But instead there's observation suggesting there wasn't that much material that erupted. This comes from both looking at the ash fallout and from the amount of gas released," he added.。

Burton said whether the main eruption is a prelude to another big eruption is yet unknown.。

The impact of the Tonga eruption was felt as far away as in Peru and Japan, and it seems to have damaged Tonga in particular, he said, adding that as the eruption seems to have severed the only communication cable into Tonga, the magnitude of the damage suffered by Tonga is still sketchy.。

Looking to the immediate future, Burton said one of the biggest threats, which isn't immediately obvious, is the risk of a deadly lava flow if there are rainstorms.。

"You can imagine if you get lots of fine ash and coarser ash landing on the ground in depths of meters, and then there's big heavy rainfall, you can get big mud flows which can be very destructive," he warned.。

As for any risk to the wider area of the Pacific Rim, Burton said it might impact ozone concentrations.。

"Because there was obviously a big interaction with seawater, it may be possible there were some unusual chemicals which were injected in great amounts into the stratosphere, things like chlorine and hydrogen chloride. It is one of the gases which can destroy ozone," he said.。

Burton said the risk of a future tsunami hitting China was now unlikely.。

"The impact of the tsunami was within 24 hours or 36 hours of the actual eruption. Now that we're three days past the eruption, the likelihood is there is no more tsunami coming out from the eruption," he said.。

油价又涨!西安92号汽油临近8元/升******

  国家发展改革委门户网站公布自3月3日24时起上调国内成品油价格。汽、柴油(标准品)价格每吨分别上调260元和255元。根据现行成品油价格形成机制,3月3日24时起,我省汽、柴油价格相应上调,92号汽油和0号柴油最高零售价格每升分别上调0.21元和0.22元。

  调整后各价区汽、柴油最高零售价格为:

  ■92号汽油:西安市场从每吨10293元(7.72元/升)升至每吨10568元(7.93元/升),中北部价区执行西安市场价格,陕南价区从每吨10399元(7.80元/升)升至每吨10674元(8.01元/升);

  ■95号汽油:西安市场从每吨10875元(8.16元/升)升至每吨11166元(8.37元/升),中北部价区执行西安市场价格,陕南价区从每吨10987元(8.24元/升)升至每吨11278元(8.46元/升);

  ■0号柴油:西安市区从每吨8695元(7.39元/升)升至每吨8950元(7.61元/升),省内其他市场从每吨8895元(7.56元/升)升至每吨9150元(7.78元/升)。

  成品油零售企业可在不超过汽、柴油最高零售价格的情况下,自主制定具体零售价格。

  汽柴油价格进入升多降少时期,西安市场92号汽油每升临近8元,陕南价区突破8元。2月17日上一轮调价,西安地区98号汽油已临10元大关,以延长壳牌加油站为例,西安地区每升为9.89元,华商报记者咨询西安市一加油站,本次98号汽油预计每升涨价0.2元左右,将会突破10元。华商报记者 李婧


来源:华商网-华商报

编辑:杨蓓蕾

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China remains Mongolia's top export destination, import supplier in first 10 months******

ULAN BATOR, Nov. 18 (Xinhua) -- China remains Mongolia's top export destination in the first 10 months of this year, accounting for 86.3 percent of Mongolia's total exports, the Mongolian National Statistics Office (NSO) said Thursday.。

The world's second-largest economy also remained Mongolia's top import supplier in the January-October period, accounting for 39.7 percent of the latter's total imports, the NSO said.。

Mongolia traded with a total of 151 economies around the world in the above-mentioned period, during which the landlocked Asian country's foreign trade volume reached 13.2 billion U.S. dollars, up 26.3 percent from the same period of last year, according to the statistical agency. Enditem。

西安确诊病例数不断降低 为什么要做积放核酸检测******

  本报讯(小编张毅伟)连日来,西安增加汇报当地新冠诊断病案数不断减少,有群众了解Dna检测为何要做那么积放?确实必须吗?1月11日,记者采访了西安交大二附院吸气与急危重症课程负责人杨拴盈。

  杨拴盈说,数据加密重污染区域的筛查次数,针对社会发展面完全清零尤为重要。对重污染区域和关键群体数据加密筛查次数,保证应检尽检、不漏一人,把很有可能掩藏的呈阳性病案检出去、早救护。

  西安此次肺炎疫情涉及到的新冠病毒归属于德尔塔突变株,具备替伏期短、快速传播快、病毒载量高及高致病强等特性。殊不知当病原体入侵身体前期,病毒载量并未做到可检测水平,这时检测很有可能发生弱阳性結果,伴随着病情的进度,才有可能发生Dna呈阳性。

  次之,病毒感染在人体内的拷贝受各种原因危害,不一样环节并不相同,没法明确样版收集时是不是为样版检测的最好时间段。不一样Dna检测标本采集(鼻咽拭子、口咽拭子、深咳嗽有痰液、肺泡灌洗液)的病毒载量不一样,在其中痰液和肺泡灌洗液呈阳性诊断率较高,但针对新冠筛查显而易见不可以当做优选,故临床医学多选用咽拭子,这就没法防止假阴性的检测結果,因而需要开展多次取样检测。



来源于:三秦都市报。

编写:田媛。

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