Yongtao Fu, Guoliang Zhang, Wanyin Wang, An Yang, Tao He, Zhangguo Zhou, Xiao Han. Identification of the Caroline Plate boundary: constraints from magnetic anomaly[J]. Acta Oceanologica Sinica, 2024, 43(8): 1-12. doi: 10.1007/s13131-023-2272-9
Citation: Yongtao Fu, Guoliang Zhang, Wanyin Wang, An Yang, Tao He, Zhangguo Zhou, Xiao Han. Identification of the Caroline Plate boundary: constraints from magnetic anomaly[J]. Acta Oceanologica Sinica, 2024, 43(8): 1-12. doi: 10.1007/s13131-023-2272-9

Identification of the Caroline Plate boundary: constraints from magnetic anomaly

doi: 10.1007/s13131-023-2272-9
Funds:  The Open Fund of the Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences, under contract No. MGE2022KG11.
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  • The Caroline Plate is located among the Pacific Plate, the Philippine Sea Plate, and the India Australia Plate, and plays a key role in controlling the spreading direction of the Philippine Sea Plate. The Caroline Submarine Plateau (or Caroline Ridge) and the Eauripik Rise on the south formed a remarkable T-shaped large igneous rock province, which covered the northern boundary between the Caroline Plate and the Pacific Plate. However, relationship between these tectonic units and magma evolution remains unclear. Based on magnetic data from the Earth Magnetic Anomaly Grid (2-arc-minute resolution) (V2), the normalized vertical derivative of the total horizontal derivative (NVDR-THDR) technique was used to study the boundary of the Caroline Plate. Results show that the northern boundary is a transform fault that runs 1400 km long in approximately 28 km wide along the N8° in E-W direction. The eastern boundary is an NNW-SSE trending fault zone and subduction zone with a width of tens to hundreds of kilometers; and the north of N4° is a fracture zone of dense faults. The southeastern boundary may be the Lyra Trough. The area between the southwestern part of the Caroline Plate and the Ayu Trough is occupied by a wide shear zone up to 100 km wide in nearly S-N trending in general. The Eauripik transform fault (ETF) in the center of the Caroline Plate and the fault zones in the east and west basins are mostly semi-parallel sinistral NNW-SSE–trending faults, which together with the eastern boundary Mussau Trench (MT) sinistral fault, the northern Caroline transform fault (CTF), and the southern shear zone of the western boundary, indicates the sinistral characteristics of the Caroline Plate. The Caroline hotspot erupted in the Pacific Plate near the CTF and formed the west Caroline Ridge, and then joined with the Caroline transform fault at the N8°. A large amount of magma erupted along the CTF, by which the east Caroline Ridge was formed. At the same time, a large amount of magma developed southward via the eastern branch of the ETF, forming the northern segment of the Eauripik Rise. Therefore, the magmatic activity of the T-shaped large igneous province is obviously related to the fault structure of the boundary faults between the Caroline Plate and Pacific Plate, and the active faults within the Caroline Plate.
  • Surface waves have notable impact on coastal and offshore structures (Goda, 2010; Xu et al., 2022; Sun et al., 2023) and on processes at the air-sea interface (Drennan et al., 2003; Huang and Qiao, 2021). Due to the limitations of observation conditions and engineering costs, numerical wave models are often used to estimate wave parameters in ocean engineering design. Although wave models have made considerable progress in the past few decades (Cavaleri et al., 2007; Roland and Ardhuin, 2014), traditional wave models have been developed using energy balance analysis (Yuan and Huang, 2012). Consequently, such models simulate the spectral distribution of wave energy rather than the sea surface height, from which almost all wave parameters are then derived by the spectral analysis.

    Significant wave period (Ts), defined as the mean period of one-third of the highest waves, is an important parameter used to characterize waves. However, because this parameter is obtained from the zero-crossing analysis of sea surface heights, it is not predicted by traditional spectral wave models (Chun and Suh, 2018). Therefore, it often needs to be estimated from the spectral periods using empirical formulas.

    In order to describe different statistical and physical characteristics of waves, there are various commonly used spectral period parameters, including the peak period Tp, zero-crossing period Tm02 $ (=\sqrt{{m}_{0}/{m}_{2}}) $, mean period Tm01 $ (={m}_{0}/{m}_{1}) $, and wave energy period Tm–1,0 $ (={m}_{-1}/{m}_{0}) $, where $ {m}_{n}={\int }_{0}^{\infty }{f}^{n}S\left(f\right)df $ is the n-th moment of the wave power spectral density function S(f), and f is the frequency (Cuadra et al. 2016; ECMWF, 2021). Many studies have investigated the relationship between different wave periods, most of which were based on simple linear analysis (Holthuijsen, 2007; Li, 2007; Suh et al., 2010; Huang et al., 2016; Ahn, 2021; Kumar and Mandal, 2022), but there were also some studies suggesting that their relationship is related to the spectral characteristics of waves (Goda, 2010; Chun and Suh, 2018). Overall, there are significant differences in the relationship between different wave periods in these studies (Li, 2007; Goda, 2010; Huang et al., 2016), and then there is still much room for studies of wave periods.

    On the basis of in situ observation data, laboratory data, and simulation data, Li (2007) argued that the relationship between Ts and the spectral periods calculated from the negative moment of the spectrum was more stable compared to other spectral periods. Using wave data from the East Sea of Japan, Chun and Suh (2018) found that the formula using Tm–1,0 produced the best fitting result for Ts. The Tm–1,0, also known as the wave energy period (Te), is one of the mean wave periods directly output by many wave models (WW3DG, 2019; ECMWF, 2021) and is often used in studies on wave energy (Bouferrouk et al., 2016; Cuadra et al., 2016). It is more stable than the peak period, especially for sea states where wind waves and swells coexist, and it is less sensitive than other commonly used wave periods (such as Tm02 and Tm01) to the high-frequency cutoff of the spectrum (Jiang et al., 2022; Anju et al., 2023; Muraleedharan et al., 2023).

    In this study, we examined the relationship between Ts and Te using wave data measured at three stations in the coastal waters of China, and we proposed an empirical formula for calculating Ts using Te. The remainder of the paper is structured as follows. The data and methods used in the study are described in Section 2. The derived empirical formula and the evaluation results are presented in Section 3. Finally, our conclusions are provided in Section 4.

    The observations were conducted in the South China Sea (SCS), East China Sea (ECS), and Bohai Sea (BS) (Fig. 1), where the surface waves were measured through acoustic surface tracking using acoustic Doppler current profilers (ADCPs) fixed to bottom-mounted frames. The observation station in the SCS is at 21.44°N, 111.39°E (Table 1). The location is approximately 6.5 km from the nearest shore, with a mean water depth of 16 m. The observational period extended from February 23, 2017, to August 1, 2017, during which a 1 000 kHz ADCP (Nortek Signature 1000) was deployed to measure surface waves. Its sampling time was set to 1024 s per hour, and the output wave spectrum was in the range of 0.02–0.99 Hz with a resolution of 0.01 Hz.

    Figure  1.  Locations of three wave measurement stations (red dots) in the coastal waters of China. Pink curves are the tracks of Typhoons Merbok, Talas, and Nesat in 2017, respectively.
    Table  1.  Information on the three observation stations (The sampling time for these observations was 1 024 s per hour, and the resolution of the wave spectra was 0.01 Hz)
    Station Location Water
    depth/m
    Distance to
    land/km
    Data period/day/month/year Instrument Spectral
    range/Hz
    SCS 21.44oN, 111.39oE 16 6.5 23/2/2017–1/8/2017 Signature 1000 0.02–0.99
    ECS 27.68oN, 121.35oE 28 25.0 4/6/2017–13/9/2017 AWAC 0.02–1.99
    BS 38.31oN, 118.91oE 19 19.0 19/12/2022–31/3/2023 AWAC 0.02–1.99
     | Show Table
    DownLoad: CSV

    The observation station in the ECS is at 27.68°N, 121.35°E. The location is approximately 25 km from the coast, with a mean water depth of 28 m. The observational period extended from June 4, 2017, to September 13, 2017. The observation station in the BS is at 38.31°N, 118.91°E. The location is approximately 19 km from the coast, with a mean water depth of 19 m. The observational period extended from December 19, 2022, to March 31, 2023. At the ECS and BS stations, 1 000 kHz ADCPs (Nortek AWAC) were used to measure surface waves. The sampling time was also set to 1 024 s per hour, but the wave spectral range was 0.02–1.99 Hz with a resolution of 0.01 Hz.

    Following previous studies (Jiang et al., 2022; Bujak et al., 2023), the metrics of bias, root mean square error (RMSE), and correlation coefficient (COR) were used to evaluate the performance of the empirical formulas for the relationship between different wave periods. The formulas for calculation of these metrics can be expressed as follows:

    $$ \mathrm{Bias}=\frac{1}{N}\sum _{i=1}^{N}({P}_{i}-{O}_{i}), $$ (1)
    $$ \mathrm{RMSE}=\sqrt{\frac{1}{N}\sum _{i=1}^{N}{({P}_{i}-{O}_{i})}^{2}}, $$ (2)
    $$ \mathrm{COR}=\frac{\displaystyle\sum _{i=1}^{N}{(P}_{i}-{\bar{\bar P})(O}_{i}-\bar{O})}{\left[\sqrt{\displaystyle\sum _{i=1}^{N}{({P}_{i}-\bar{P})}^{2}}\right]\left[\sqrt{\displaystyle\sum _{i=1}^{N}{({O}_{i}-\bar{O})}^{2}}\right]}, $$ (3)

    where O represents the observed wave period, P represents the wave period modelled using empirical formulas, and N represents the number of available observation data points.

    China’s coastal waters are affected by monsoons, cold fronts, typhoons, and other factors that create complex and variable surface wave conditions. The SCS is controlled by the Southeast Asian monsoon system. Our observations in this region, conducted in February–August, were affected first by the winter monsoon and then by the summer monsoon. Overall, the observed surface waves were dominated by swells, with significant wave heights in the range of 0.3–1.5 m and Ts in the range of 3–7 s. However, during the observational period, the passage of two severe tropical storm processes resulted in a long Ts of 8.9 s on June 12 and a large significant wave height of 2.4 m on July 16 (Figs 2a and b).

    Figure  2.  Time series of significant wave height (a), period (b), and ratio of Ts to Te (c) observed in the South China Sea during March–August 2017. In (b), blue dots and pink dots represent significant wave period Ts and wave energy period Te, respectively

    Our observations in the ECS were obtained in summer, when the sea area is susceptible to the influence of typhoons. During our observation period, owing to the influence of Typhoon Nesat, the maximum significant wave height exceeded 5 m, and the maximum Ts exceeded 12 s (Figs 3a and b).

    Figure  3.  Similar to Fig. 2 but for wave data in the East China Sea observed during June–September 2017.

    The BS is a shallow, semi-enclosed marginal sea where the surface waves are dominated by wind waves. During our observational period, approximately 81% of the valid data segments had a significant wave height of <1 m and Ts of <5 s. However, owing to the influence of winter cold fronts, there were also some observational segments with significant wave heights of >3 m and Ts of >7 s (Figs 4a and b).

    Figure  4.  Similar to Fig. 2 but for wave data in the Bohai Sea observed during December 2022 to March 2023.

    Previous studies typically used linear fitting with constant coefficients to examine the relationship between different wave periods (Li, 2007; Huang et al., 2016; Ahn, 2021). Figure 5 shows scatter plots of Ts and Te measured at the three stations, together with their linear fitting formulas in the form of Ts = αTe, where α is a constant. It is evident that the coefficient of the linear fitting of these two parameters is not the same at each of the three stations. In the SCS, dominated by swells, the value of coefficient α is 0.95, whereas it is 0.99 in the BS. This finding is similar to that of previous studies on fitting wave periods, where different fitting coefficients are usually obtained when using different observational datasets (Li, 2007; Ahn, 2021). It means that the constant coefficient fitting method has a certain dependence on local wave characteristics, which to some extent limits the applicability of this fitting method.

    Figure  5.  Scatter plots of significant wave period Ts against wave energy period Te measured in the South China Sea (SCS) (a), the East China Sea (ECS) (b), and the Bohai Sea (BS) (c). Pink lines represent the linear regressions of Te on Ts in each panel.

    Although Ts compares well with Te for each of the three observation datasets (Figs 2b, 3b, and 4b), the ratio of the two parameters (i.e., Ts/Te) varies greatly, both spatially and temporally, in the range of 0.40–1.07 (Figs 2c, 3c, and 4c). This variation might be related to the wave spectral characteristics at the three stations. The Goda peakedness parameter (see ECMWF, 2021), which is an important parameter often used to represent wave spectral characteristics (Fairley et al., 2020; Le Merle et al., 2021), can be calculated directly using the wave spectrum as follows:

    $$ {Q}_{p}=\frac{2}{{m}_{0}^{2}}{\int }_{0}^{\infty }f{S}^{2}\left(f\right)df. $$ (4)

    This parameter is a measure of the sharpness of the wave spectrum, where larger Qp usually correspond to narrower spectra (or more sharply peaked spectra), and vice versa. Compared to other commonly used wave bandwidth parameters, it is more reliable because of the stable quantities such as m0 and S(f) used in its calculation, and it is independent of the high-frequency cutoff choice of the spectrum (Prasada Rao, 1988). It has been used to fit the relationship between Ts and the peak period by Chun and Suh (2018) and to predict wave runup on beaches by Bujak et al. (2023).

    Figure 6a shows the relationship between the ratio of Ts to Te and Qp derived from the wave data obtained in the SCS. Overall, this ratio varies approximately exponentially with Qp. It is slightly larger than 1 when Qp is greater than 2 and decreases rapidly with Qp when the latter is less than 2. Therefore, on the basis of the least squares method, we proposed the following empirical regression model:

    Figure  6.  Scatter plot of the ratio of significant wave period Ts and wave energy period Te as a function of the Goda peakedness parameter Qp for wave data in the South China Sea (SCS) (a), the East China Sea (ECS) (b), and the Bohai Sea (BS) (c). Pink curves are exponential fits using Eq. (5).
    $$ {T}_{s}=\left[1.02-2.8\mathrm{exp}(-2.49{Q}_{p})\right]{T}_{e}. $$ (5)

    The performance of this formula and that of the constant coefficient linear fitting formula (see Fig. 5a) are respectively shown in Figs 7a and d. For wave data in the SCS, the bias, RMSE, and COR between the Ts modelled using the linear fitting formula and the observations are 0.052 s, 0.360 s, and 0.930, respectively (Table 2). However, when using Eq. (5), the bias and RMSE decreased to 0.010 s and 0.230 s, respectively, while the COR increased to 0.970, i.e., all markedly improved relative to the linear fitting results.

    Figure  7.  Scatter plots comparing the observed significant wave period Ts and modelled Ts using different formulas for wave data from the South China Sea (SCS) (the left column), the East China Sea (ECS) (the middle column), and the Bohai Sea (BS) (the right column). The panels in the top, second, third, and bottom rows correspond to the comparison for linear fitting with constant coefficients in Fig. 5, Eq. (5), Eq. (6), and Eq. (7), respectively. Pink lines represent the 1:1 fittings.
    Table  2.  Statistical comparisons of the significant wave period modelled by different empirical formulas relative to the observations
    Formulaslinear fitting in Fig. 5Eq. (5)Eq. (6)Eq. (7)

    SCS
    Bias/s0.0520.0100.4810.149
    RMSE/s0.3600.2300.3800.370
    COR0.9300.9700.9300.920

    ECS
    Bias/s0.1360.0030.560–0.080
    RMSE/s0.5400.2900.5600.560
    COR0.8800.9700.8800.880

    BS
    Bias/s0.093–0.0040.256–0.309
    RMSE/s0.2900.1800.2800.300
    COR0.9600.9900.9600.960
     | Show Table
    DownLoad: CSV

    The sea conditions in the ECS and BS are different to those in the SCS (Figs 24), but the relationship of the ratio of Ts to Te with Qp in the ECS and BS is fairly consistent with that in the SCS (Figs 6b and c). In the ECS, the bias, RMSE, and COR between the Ts modelled using the linear fitting formula (Fig. 5b) and the observed data are 0.136 s, 0.54 s, and 0.88, respectively (Fig. 7b). However, when using Eq. (5) including Qp, the bias and RMSE between them decreased to 0.003 and 0.29 s, respectively, and the COR increased to 0.97 (Fig. 7e). In the BS, the bias, RMSE, and COR between the Ts modelled using the linear fitting formula (Fig. 5c) and the observed data are 0.093 s, 0.29 s, and 0.96, respectively (Fig. 7c). However, when using Eq. (5), the bias and RMSE between them decreased to −0.004 and 0.18 s, respectively, and the COR increased to 0.99 (Fig. 7f). These improvements demonstrate the applicability of our derived formula [i.e., Eq. (5)] to the coastal waters of China.

    Using in situ observations from the BS, laboratory data, and simulation data, Li (2007) derived a linear empirical formula for fitting Ts using Te, which can be expressed as follows:

    $$ {T}_{s}=1.035{T}_{e}. $$ (6)

    For our three sets of wave observations, the ratio of Ts to Te is in the range 0.40–1.07. Therefore, although the fitting coefficient of Li (2007) is greater than ours (Fig. 5), it is still within the range of our observed ratios.

    Using wave data from the East Sea of Japan, Chun and Suh (2018) estimated Ts as follows:

    $$ {T}_{s}=0.76{T}_{e}^{1.11}. $$ (7)

    Figures 7gl show scatter plot comparisons between the Ts modelled by the above two formulas and our measured Ts in the SCS, ECS, and BS. The results show that the performance of our derived formula [i.e., Eq. (5)] is substantially better than that of the other two formulas in relation to our wave data obtained in the coastal waters of China (Table 2).

    The wave period, together with the wave height, is an important parameter in ocean engineering and physical oceanography. Compared to other wave spectral periods, the wave energy period is relatively stable and less sensitive to high-frequency cutoff of the spectrum, and it is also one of the wave periods directly output by many wave modes. In this study, we investigated the relationship between the significant wave period and wave energy period using wave data measured at three stations in the SCS, ECS, and BS.

    In our observational data, although the two wave periods might appear similar, the ratio between them varies greatly. Therefore, traditional linear fitting using constant coefficients does not provide robust and universally applicable results. We found that this ratio is closely related to the Goda peakedness parameter of wave spectra. Therefore, we proposed an empirical formula for their relationship. Evaluation results showed that the performance of this proposed formula is notably better than that of both traditional linear fitting using constant coefficients and several empirical formulas presented in previous studies.

    In addition to the wave energy period, other spectral periods are commonly used in wave studies (Cuadra et al., 2016). Although their performance is not as robust as that of the wave energy period, they do represent the spectral characteristics of waves from different aspects. In future studies, we will examine the relationship between significant wave period and these other spectral periods.

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