Relative paleointensity (RPI) stacks provide a relative, global paleointensity variation, which reflects variations in the geocentric axial dipole moment. Previous calibrations of an RPI stack rely on adjusting a mean RPI to a mean of virtual axial dipole moments (VADMs), which are selected from absolute paleointensity (API) databases. To achieve more quantitative calibration of an RPI stack into absolute values, we propose a novel approach that compares (1) tephra-derived APIs and (2) the same tephras' horizons, in the oxygen isotope stratigraphy, tied RPIs (hereafter termed the “TA-TOR” approach). For the TA-TOR approach, APIs were newly determined for welded tuffs of 15 pyroclastic flow deposits in Japan. Eight of the 15 new APIs and 2 previously reported APIs have tephra horizons in the oxygen isotope stratigraphy. Based on the 10 data of the TA-TOR approach, combined with 4 data of the transitional field, VADMs calculated from the APIs (VADM_API) were compared with isochronous RPIs from two RPI stacks, PISO-1500 and Sint-2000. The 14 data points in RPI vs. VADM_API diagrams show a linear relationship with correlation coefficients of 0.83–0.89. Using the observed linear relationships, the two RPI stacks were reliably calibrated to VADM values (VADM_RPI) for the period since 1.1 Ma. Compared with the VADMs calibrated by the previous studies, the present calibration provides a 12–13% smaller median/mean and a larger dispersion as represented by a 15–53% larger standard deviation for the two RPI stacks. The similarities between the cumulative distributions of VADM_RPI from the two stacks and those of VADMs selected from the API database indicate the reliability of the present calibration. These results show that the present calibration, which relies on the TA-TOR approach, accurately converts a RPI stack into VADM_RPI values and will contribute to studies on time variations in the geocentric axial dipole moment, sedimentary RPI, and cosmogenic radionuclides. Variations in VADM_RPI for the past 1.1 Myr, obtained from PISO-1500 and Sint-2000 via the present calibration, can be used as standard geocentric axial dipole variations for this period.

相对古强度 (RPI) 叠加提供了相对的全球古强度变化，它反映了地心轴偶极矩的变化。先前对 RPI 堆栈的校准依赖于将平均 RPI 调整为虚拟轴向偶极矩 (VADM) 的平均值，这些值是从绝对古强度 (API) 数据库中选择的。为了将 RPI 堆栈更定量地校准为绝对值，我们提出了一种新方法，该方法比较 (1) tephra 衍生的 API 和 (2) 在氧同位素地层学中，与 RPI 相关的 RPI（以下称为“ TA-TOR”方法）。对于 TA-TOR 方法，新确定了日本 15 个火山碎屑流沉积物的焊接凝灰岩的 API。15 种新 API 中有 8 种和之前报告的 2 种 API 在氧同位素地层中有火山灰层。_API ) 与来自两个 RPI 堆栈 PISO-1500 和 Sint-2000 的同步 RPI 进行了比较。RPI 与 VADM _API图中的 14 个数据点显示相关系数为 0.83–0.89 的线性关系。使用观察到的线性关系，两个 RPI 堆栈被可靠地校准为1.1 Ma 以来的VADM 值 (VADM _RPI )。与先前研究校准的 VADM 相比，本校准提供了 12-13% 的中值/平均值和更大的分散，如两个 RPI 堆栈的标准偏差大 15-53%。VADM _RPI累积分布之间的相似性来自两个堆栈和从 API 数据库中选择的 VADM 的堆栈表明当前校准的可靠性。这些结果表明，目前的校准依赖于 TA-TOR 方法，准确地将 RPI 堆栈转换为 VADM _RPI值，并将有助于研究地心轴偶极矩、沉积 RPI 和宇宙放射性核素的时间变化。通过当前校准从 PISO-1500 和 Sint-2000 获得的过去 1.1 Myr 的VADM _RPI变化可用作该时期的标准地心轴向偶极子变化。