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Seismic tremors and Their Relation to Cryosphere Dynamics in April 2015 around the Lützow-Holm Bay, East Antarctica

International Journal of Geosciences 2017年第8期8卷 1025-1047页

作者： Masaki Kanao Takahiko Murayama Masa-Yuki Yamamoto Yoshiaki Ishihara National Institute of Polar Research Research Organization of Information and Systems Tokyo Japan Japan Weather Association Tokyo Japan Kochi University of Technology Kochi Japan Japan Aerospace Exploration Agency Kanagawa Japan

Characteristics and statistics of seismic tremors occurring during April 2015 were investigated by using short-period and broadband seismographs deployed at Syowa Station (SYO), in the Lützow-Holm Bay (LHB), East Antarctica. In order to examine a relationship between surface environments in particular cryosphere variation, the MODIS satellite images were utilized for comparison with the detected tremor events. Since a large volume of sea-ice was discharged during the April, together with several large icebergs passed through from the west to the east at northern edge of the fast sea-ice of LHB, it was expected to detect seismic tremors involving cryospehre dynamics. During the month, a total number of 49 tremor events including short duration ice shocks were identified. Majority of the events (N = 39) had their duration times more than 15 minutes, which were divided into both tremors and ice shocks on the basis of experienced definition at SYO. Cryospheric sources recorded by seismic tremors were classified into several origins (collision, calving, crevassing, crashing, etc.): “crevassing events” along the large cracks inside the fast sea-ice in LHB (04 April), “discharge events” of fast sea-ice from the Bay (07 April), “collision events” between iceberg and the edge of fast sea-ice (14 April), “crashing movement” between fragmentation of fast sea-ice and packed sea-ice (18 April), and other origins. In particular, strong amplitude tremors with harmonic overtones were assumed to be occurred independently from whether condition, because these overtone tremors were identified at less stormy days by comparison with infrasound data at SYO.

关键词： Seismic tremors Ice Shocks Cryosphere Dynamics Sea-Ice Icebergs Lützow-Holm Bay Antarctica

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Resistant tremors and Unexplained Weight Loss Could Also Be a Sign of HIV

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Neuroscience & Medicine 2015年第3期6卷 81-83页

作者： Mohammed Hamdy Ibrahim Shivram Kumar Janhavi Sirsat Mohamed Khalid Kiran Kumar Department of Neurology GMC Hospital Ajman UAE Gulf Medical University Ajman UAE Department of Internal Medicine GMC Hospital Ajman UAE

This case study is done to show a different type of presentation of a HIV (Human Immunodeficiency Virus) patient. Neurological symptoms in HIV are normally due to Progressive Multifocal Leukoencephalopathy (PML) which is a reactivated infection caused by John Cunningham virus (JC virus). The disease causes fatal demyelination of the central nervous system (CNS). This case presented a 51-year-old Nigerian man who complained of resistant tremors and unexplained weight loss. The patient was suspected to have HIV when a MRI scan revealed T2/FLAIR hyper intensity of white matter which was a sign of PML. HIV ELISA was done and came back with a positive result. PML presenting in the form of tremors is very rare and more research is required to focus on the neurological presentation of HIV.

关键词： Human Immunodeficiency Virus tremors Progressive Multifocal Leukoencephalopathy

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Effects of DL0705 on tremors induced by 6-Hydroxydopamine lesions in the medial forebrain bundle of rats

Effects of DL0705 on tremors induced by 6-Hydroxydopamine le...

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中国药理学会第十次全国学术会议

作者： Xin Yu~(1,2),Guorong He~1,Lan Sun~1,Xi Lan~1,Zhaohong Xuan~(1,2),Guanhua DU~(1*) (1.Institute of Materia,Medica Chinese Academy of Medical Sciences and Peking Union Medical College,Beijing 100050,China 2.Department of Pharmacology,School of Pharmacy,Yantai University,Yantai 264005,China,

Tremor is one of the core symptoms of Parkinson’s disease(PD).The purpose of the present study is to assess the dose-effects and time-effects of DL0705 on the tremors,induced by a neurochemical lesion,6-hydroxydopami... 详细信息

关键词： Parkinson’s disease DL0705 6-hydroxydopamine tremors

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Statistics of Seismic tremors with Harmonic Overtones Recorded at Syowa Station, Antarctica: October 2014-March 2015

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International Journal of Geosciences 2017年第6期8卷 811-820页

作者： Masaki Kanao National Institute of Polar Research Research Organization of Information and Systems Tokyo Japan

During the period from October 2014 to March 2015, a total number of 82 seismic tremors and 66 ice-quakes were identified in both three-component short-period seismographs (HES) and broadband seismographs (STS-1) at Syowa Station (SYO), Antarctica. Statistics of the number of these tremors indicated that many tremors were likely to occur when large increases in temperature and/or wind speed during the period. This implied that the rapid increase in temperature enhanced a melting speed of cryosphere environment with generating seismic energy;the tremors were also excited by stormy conditions, associated with interactive resonance between sea-ices and oceanic swells. The characteristic tremors of harmonic overtones with strong amplitudes were explained by repetitive sources, suggesting inter-glacial asperities such as the collision of icebergs and fast sea-ice, calving of glaciers/ice-streams at the coastal environment of Antarctica. These high amplitude tremors occurred independently from other majority types of events, characterized by non-linear, small amplitude and weak signals at the stormy condition and rapid increase in temperature.

关键词： Seismic tremors Harmonic Overtones Statistics Syowa Station Antarctica

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