Please wait, while we are loading the content...
| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Gotoh, K. Hattori, K. Hayakawa, M. |
| Copyright Year | 2003 |
| Description | Author affiliation: Univ. of Electro-Commun., Chofu, Japan (Gotoh, K.) |
| Abstract | The purpose of this report is to find out any ULF signature for the earthquakes in Izu islands in July 2000 (associated with volcanic activity) by means of a new signal processing method. The ULF data observed at three closely spaced stations in Izu peninsula, are subjected to the principal component analysis (PCA), and we have found that this PCA is very effective in distinguishing among different sources of ULF emissions (geomagnetic variation, man-made noise, and seismogenic emission). While, the first and second principal components are found to be associated with geomagnetic variation and man-made activity, respectively, the third principal component (residual noise like seismogenic emission if it exists) at night has indicated a significant temporal evolution; an enhancement for about 1.5 months (from early May to middle June) and a conspicuous minimum about ten days before the first earthquake on July 1 (magnitude 6.4), followed by a sharp increase a few days before the earthquakes. Furthermore, this component is found to be back to the background level a few months later than the earthquakes. This temporal pattern is in good agreement with those for previous large earthquake (Spitak, Loma Prieta, Guam and Biak earthquakes), so that this temporal evolution for the third principal component found by PCA is likely to be a precursory ULF signature of those Izu islands' earthquakes with its intensity of the order of 5% of the first principal component. |
| Sponsorship | China Inst. of Commun. (CIC) Beijing Univ. of Posts and Telecommun. (BUPT) Inst. of Elec. Eng. of Japan (IEEJ) Inst. of Electron., Information, Commun. Eng. of Japan (IEICEJ) |
| Starting Page | 217 |
| Ending Page | 220 |
| File Size | 460267 |
| Page Count | 4 |
| File Format | |
| ISBN | 7563508023 |
| DOI | 10.1109/CEEM.2003.237878 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2003-11-04 |
| Publisher Place | China |
| Access Restriction | Subscribed |
| Rights Holder | China Institute of Communications(CIC) |
| Subject Keyword | Earthquakes Principal component analysis Signal processing Signal analysis Geomagnetism Frequency Ground penetrating radar Geophysical measurement techniques Volcanic activity Polarization |
| Content Type | Text |
| Resource Type | Article |
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community. It is sponsored and mentored by Ministry of Education, Government of India, through its National Mission on Education through Information and Communication Technology (NMEICT). Filtered and federated searching is employed to facilitate focused searching so that learners can find the right resource with least effort and in minimum time. NDLI provides user group-specific services such as Examination Preparatory for School and College students and job aspirants. Services for Researchers and general learners are also provided. NDLI is designed to hold content of any language and provides interface support for 10 most widely used Indian languages. It is built to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular forms of access devices and differently-abled learners. It is designed to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. It is developed, operated and maintained from Indian Institute of Technology Kharagpur.
Learn more about this project from here.
NDLI is a conglomeration of freely available or institutionally contributed or donated or publisher managed contents. Almost all these contents are hosted and accessed from respective sources. The responsibility for authenticity, relevance, completeness, accuracy, reliability and suitability of these contents rests with the respective organization and NDLI has no responsibility or liability for these. Every effort is made to keep the NDLI portal up and running smoothly unless there are some unavoidable technical issues.
Ministry of Education, through its National Mission on Education through Information and Communication Technology (NMEICT), has sponsored and funded the National Digital Library of India (NDLI) project.
| Sl. | Authority | Responsibilities | Communication Details |
|---|---|---|---|
| 1 | Ministry of Education (GoI), Department of Higher Education |
Sanctioning Authority | https://www.education.gov.in/ict-initiatives |
| 2 | Indian Institute of Technology Kharagpur | Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project | https://www.iitkgp.ac.in |
| 3 | National Digital Library of India Office, Indian Institute of Technology Kharagpur | The administrative and infrastructural headquarters of the project | Dr. B. Sutradhar bsutra@ndl.gov.in |
| 4 | Project PI / Joint PI | Principal Investigator and Joint Principal Investigators of the project |
Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon |
| 5 | Website/Portal (Helpdesk) | Queries regarding NDLI and its services | support@ndl.gov.in |
| 6 | Contents and Copyright Issues | Queries related to content curation and copyright issues | content@ndl.gov.in |
| 7 | National Digital Library of India Club (NDLI Club) | Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach | clubsupport@ndl.gov.in |
| 8 | Digital Preservation Centre (DPC) | Assistance with digitizing and archiving copyright-free printed books | dpc@ndl.gov.in |
| 9 | IDR Setup or Support | Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops | idr@ndl.gov.in |
|
Loading...
|