| Gravity measurements in southeastern alaska reveal negative gravity rate of change caused by glacial isostatic adjustment | |
| Sun, W.1,2; Miura, S.3; Sato, T.3; Sugano, T.1; Freymueller, J.4; Kaufman, M.4; Larsen, C. F.4; Cross, R.4; Inazu, D.3 | |
| 刊名 | Journal of geophysical research-solid earth
 |
| 2010-12-03 | |
| 卷号 | 115页码:17 |
| ISSN号 | 0148-0227 |
| DOI | 10.1029/2009jb007194 |
| 通讯作者 | Sun, w.(sunw@gucas.ac.cn) |
| 英文摘要 | For the past 300 years, southeastern alaska has undergone rapid ice-melting and land uplift attributable to global warming. corresponding crustal deformation (3 cm/yr) caused by the little ice age retreat is detectable with modern geodetic techniques such as gps and tidal gauge measurements. geodetic deformation provides useful information for assessing ice-melting rates, global warming effects, and subcrustal viscosity. nevertheless, integrated geodetic observations, including gravity measurements, are important. to detect crustal deformation caused by glacial isostatic adjustment and to elucidate the viscosity structure in southeastern alaska, japanese and u. s. researchers began a joint 3-year project in 2006 using gps, earth tide, and absolute gravity measurements. a new absolute gravity network was established, comprising five sites around glacier bay, near juneau, alaska. this paper reports the network's gravity measurements during 2006-2008. the bad ocean model in this area hindered ocean loading correction: large tidal residuals remain in the observations. accurate tidal correction necessitated on-site tidal observation. results show high observation precision for all five stations: <1 mu gal. the gravity rate of change was found to be -3.5 to -5.6 mu gal/yr in the gravity network. furthermore, gravity results obtained during the 3 years indicate a similar gravity change rate. these gravity data are anticipated for application in geophysical studies of southeastern alaska. using gravity and vertical displacement data, we constructed a quantity to remove viscoelastic effects. the observations are thus useful to constrain present-day ice thickness changes. a gravity bias of about -13.2 +/- 0.1 mgal exists between the potsdam and current fg5 gravity data. |
| WOS关键词 | UPLIFT ; EARTH ; TIDES |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| 语种 | 英语 |
| 出版者 | AMER GEOPHYSICAL UNION |
| WOS记录号 | WOS:000285020600003 |
| 内容类型 | 期刊论文 |
| URI标识 | http://www.corc.org.cn/handle/1471x/2414696 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Sun, W. |
| 作者单位 | 1.Univ Tokyo, Earthquake Res Inst, Tokyo 1130032, Japan 2.Chinese Acad Sci, Grad Univ, Key Lab Computat Geodynam, Beijing 100049, Peoples R China 3.Tohoku Univ, Res Ctr Predict Earthquakes & Volcan Erupt, Sendai, Miyagi 9808578, Japan 4.Univ Alaska, Inst Geophys, Fairbanks, AK 99775 USA |
| 推荐引用方式 GB/T 7714 | Sun, W.,Miura, S.,Sato, T.,et al. Gravity measurements in southeastern alaska reveal negative gravity rate of change caused by glacial isostatic adjustment[J]. Journal of geophysical research-solid earth,2010,115:17. |
| APA | Sun, W..,Miura, S..,Sato, T..,Sugano, T..,Freymueller, J..,...&Inazu, D..(2010).Gravity measurements in southeastern alaska reveal negative gravity rate of change caused by glacial isostatic adjustment.Journal of geophysical research-solid earth,115,17. |
| MLA | Sun, W.,et al."Gravity measurements in southeastern alaska reveal negative gravity rate of change caused by glacial isostatic adjustment".Journal of geophysical research-solid earth 115(2010):17. |
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