High-Resolution Aeromagnetic Survey of Mono Basin and Long Valley, California

A detailed aeromagnetic survey of Mono Basin and Long Valley, California was flown by EON Geosciences Inc. from October 25th to November 11th, 2012. The high-resolution helicopter survey was flown at a flightline spacing of 400 m, a flightline azimuth of 65 degrees, a nominal flightline elevation above ground of 150 m, and consists of about 6,125 line-kilometers. Tie lines were spaced at a 4-km interval with a flightline azimuth of 155 degrees. A Scintrex CS-3 cesium magnetometer was used throughout the airborne survey and a GEM Systems GSM-19 magnetometer was used as a base station magnetometer located near the Mammoth Lake Yosemite airport. Data were processed by the contractor and include corrections for diurnal variations of the Earth's magnetic field, magnetic field of the helicopter, tie-line leveled, micro-leveled, and an International Geomagnetic Reference of the Earth for the time of the survey. Data presented include: survey report, ASCII database, a data dictionary, and a grid of residual magnetic intensity in nanoteslas (nT). Aeromagnetic maps derived from the survey were used and published by Peacock and others (2015).2012年10月25日至11月11日，EON地球科学公司（EON Geosciences Inc.）完成了加利福尼亚州莫诺盆地（Mono Basin）与长谷（Long Valley）区域的详细航空磁测（aeromagnetic survey）作业。本次高分辨率直升机航测的飞行线间距为400米，飞行方位角为65度，标称地面飞行高度为150米，总测线长度约6125测线公里。联络测线的布设间隔为4千米，飞行方位角为155度。本次航空磁测全程使用Scintrex CS-3型铯磁力仪（cesium magnetometer），并在马姆莫斯湖优胜美地机场附近布设GEM Systems GSM-19型磁力仪作为基站磁力仪。数据由承包商完成处理，校正内容涵盖地球磁场日变校正、直升机自身磁场校正、联络测线平差、微平差，以及测量时段对应的地球国际地磁参考场（International Geomagnetic Reference Field）校正。本次公开的数据成果包括：调查报告、ASCII格式数据库、数据字典，以及以纳特斯拉（nT）为单位的剩余磁强度网格数据。本次航测生成的航空磁图已由Peacock等人（2015）使用并发表。