Absolute Paleointensities From the Gilbert-Gauss to the Upper Mammoth Reversal Sequences in Lavas on the Wai'anae Volcano, Hawaii

耳朵- 0207787埃米利奥Herrero-Bervera根据夏威夷O'ahu岛5个序列的240个熔岩流测量的古地磁方向覆盖了约0.36 Ma的地磁场变化，包括连续的Gilbert-Gauss （3.57 Ma）、Lower Mammoth （3.33 Ma）和Upper Mammoth （3.22Ma）逆转的详细记录。因此，很明显，对这些观测的适当分析需要记录总场矢量，从而对绝对古强度进行详尽的研究。研究的主要目的是了解在诸如反转或偏移等时期的磁场变化，但也与反转前后的关键时间间隔有关，到目前为止，只有少数沉积剖面的记录与观测结果相互矛盾。Wai'anae序列首次提供了记录一段时间内（包括几个极性间隔）的场变化的绝佳机会，从而记录了不同时间常数下的场矢量。这是提取和提出地球动力学理论和数值模拟的重要约束的基本条件。多个记录提供了确定字段值的适用性和结果的置信度的最佳方法。

EAR-0207787Emilio Herrero-Bervera Paleomagnetic directions measured from 240 lava flows in 5 sequences on the island of O'ahu (Hawaii) cover about 0.36 Ma of geomagnetic field changes and include detailed records of the successive Gilbert-Gauss (3.57 Ma), Lower Mammoth (3.33 Ma) and Upper Mammoth (3.22Ma) reversals. Thus, it is clear that proper analysis of these observations require to document the total field vector and thus to conduct an exhaustive study of absolute paleointensity. The objectives of the study are primarily related to the knowledge of the field variations during periods like reversals or excursions but also to the critical time intervals that precede and follow reversals that so far have been only documented from a few sedimentary sections with conflicting observations. The Wai'anae sequences offer the first exceptional opportunity to document field variations over a time period that includes several polarity intervals and thus document the field vector over various time constants. This is a basic condition to extract and bring up significant constraints for theoretical and numerical modeling of the geodynamo. Multiple records offer the best approach to determine the suitability of the field values and the degree of confidence of the results.