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374 results for “East Pacific”
Relocated Seismicity Catalogs on the Discovery Transform Fault, 4S on the East Pacific Rise
<p>Two relocated earthquake catalogs are provided for the Discovery Transform Fault located at 4ºS on the East Pacific Rise. There is a microseismicity catalog representing one year of activity recorded during a 2008 ocean bottom seismometer deployment, which includes 12,635 events with local magnitudes, M<sub>L</sub>, between 0 and 4.1. The second catalog includes 24 years (1 January 1990 - 1 April 2013) of earthquakes obtained from the global Centroid Moment Tensor (CMT) catalog, a total of 15 events, with seismic moment magnitudes, M<sub>W</sub>, between 5.4 and 6.0.</p> <p>Microseismicity was relocated using the HypoDD relocation algorithm (Waldhauser, 2001), while the CMT events were relocated using a teleseismic surface-wave cross-correlation technique (McGuire, 2008). The 15 CMT events all relocated into one of five distinct rupture patches on the Discovery Transform Fault. In general, microseismicity was found to be reduced within these large, repeating rupture patches.</p> <p>A more detailed description of the methodology used to relocate both catalogs, as well as a discussion on the correlation between seismic behavior and fault structure on the Discovery Transform Fault is provided in:</p> <p>Wolfson-Schwehr, M., Boettcher, M. S., McGuire, J. J., & Collins, J. A. (2014). The relationship between seismicity and fault structure on the Discovery transform fault, East Pacific Rise. <em>Geochemistry, Geophysics, Geosystems, </em>15(9), 3698–3712. <a href="https://doi.org/10.1002/2014GC005445">https://doi.org/10.1002/2014GC005445</a></p> <p>Seismic Catalogs:</p> <ul> <li>Discovery_CMT_relocated_seismicity_1990_2013.csv</li> <li>Discovery_relocated_microseismicity_2008.csv</li> </ul> <p>Additional References:</p> <p>1. McGuire, J. J. (2008). Seismic cycles and earthquake predictability on East Pacific Rise transform faults. <em>Bulletin of the Seismological Society of America</em>, 98(3), 1067-1084. <a href="https://www.whoi.edu/cms/files/McGuire_BSSA_2008_48643.pdf">https://www.whoi.edu/cms/files/McGuire_BSSA_2008_48643.pdf</a></p> <p>2. Waldhauser, F. (2001). hypoDD--A program to compute double-difference hypocenter locations. <br> <a href="https://academiccommons.columbia.edu/doi/10.7916/D8SN072H">https://academiccommons.columbia.edu/doi/10.7916/D8SN072H</a></p>
What Controls the Mean East–West Sea Surface Temperature Gradient in the Equatorial Pacific: The Role of Cloud Albedo
<p>Climatologies for the climate model simulations performed by Burls and Fedorov 2014, Journal of Climate, <a href="https://doi.org/10.1175/JCLI-D-13-00255.1">https://doi.org/10.1175/JCLI-D-13-00255.1</a>. This table shows how the names of the simulation files provided in this dataset relate to the experiment names provided in Table 1 of Burls and Fedorov (2014, JOC).</p> <table> <thead> <tr> <th scope="col">Experiment # in Article (Table 1)</th> <th scope="col">Name of Files</th> </tr> </thead> <tbody> <tr> <td>1</td> <td>PreInd_T31_gx3v7*.nc</td> </tr> <tr> <td>2</td> <td>80p_op_LWP_1590deg_T31_gx3v7*.nc</td> </tr> <tr> <td>3</td> <td>60p_op_LWP_1590deg_T31_gx3v7*.nc</td> </tr> <tr> <td>4</td> <td>40p_op_LWP_1590deg_T31_gx3v7*.nc</td> </tr> <tr> <td>5</td> <td>20p_op_LWP_1590deg_T31_gx3v7*.nc</td> </tr> <tr> <td>6</td> <td>20p_LWP_1590deg_T31_gx3v7*.nc</td> </tr> <tr> <td>7</td> <td>40p_LWP_1590deg_T31_gx3v7*.nc</td> </tr> <tr> <td>8</td> <td>60p_LWP_1590deg_T31_gx3v7*.nc</td> </tr> <tr> <td>9</td> <td>80p_LWP_1590deg_T31_gx3v7*.nc</td> </tr> <tr> <td>10</td> <td>20p_ILWP_1590deg_tropx2_T31_gx3v7*.nc</td> </tr> <tr> <td>11</td> <td>40p_ILWP_1590deg_tropx2_T31_gx3v7*.nc</td> </tr> <tr> <td>12</td> <td>60p_ILWP_1590deg_tropx2_T31_gx3v7*.nc</td> </tr> <tr> <td>13</td> <td>80p_ILWP_1590deg_tropx2_T31_gx3v7*.nc</td> </tr> <tr> <td>14</td> <td>20p_ILWP_1590deg_tropx4_T31_gx3v7*.nc</td> </tr> <tr> <td>15</td> <td>40p_ILWP_1590deg_tropx4_T31_gx3v7*.nc</td> </tr> <tr> <td>16</td> <td>60p_ILWP_1590deg_tropx4_T31_gx3v7*.nc</td> </tr> <tr> <td>17</td> <td>80p_ILWP_1590deg_tropx4_T31_gx3v7*.nc</td> </tr> <tr> <td>18</td> <td>20p_ILWP_3060deg_tropx8_T31_gx3v7*.nc</td> </tr> <tr> <td>19</td> <td>40p_ILWP_3060deg_tropx8_T31_gx3v7*.nc</td> </tr> <tr> <td>20</td> <td>60p_ILWP_3060deg_tropx8_T31_gx3v7*.nc</td> </tr> <tr> <td>21</td> <td>80p_ILWP_3060deg_tropx8_T31_gx3v7*.nc</td> </tr> <tr> <td>22</td> <td>PreInd_0.9x1.25_gx1v6*.nc</td> </tr> <tr> <td>23</td> <td>40p_LWP_1590deg_0.9x1.25_gx1v6*.nc</td> </tr> <tr> <td>24</td> <td>60p_LWP_1590deg_0.9x1.25_gx1v6*.nc</td> </tr> <tr> <td>25</td> <td>40p_ILWP_1590deg_tropx2_0.9x1.25_gx1v6*.nc</td> </tr> <tr> <td>26</td> <td>60p_ILWP_1590deg_tropx2_0.9x1.25_gx1v6*.nc</td> </tr> </tbody> </table> <p>Article abstract:</p> <p>The mean east–west sea surface temperature gradient along the equator is a key feature of tropical climate. Tightly coupled to the atmospheric Walker circulation and the oceanic east–west thermocline tilt, it effectively defines tropical climate conditions. In the Pacific, its presence permits the El Niño–Southern Oscillation phenomenon. What determines this temperature gradient within the fully coupled ocean–atmosphere system is therefore a central question in climate dynamics, critical for understanding past and future climates. Using a comprehensive coupled model [Community Earth System Model (CESM)], the authors demonstrate how the meridional gradient in cloud albedo between the tropics and midlatitudes (Δα) sets the mean east–west sea surface temperature gradient in the equatorial Pacific. To change Δα in the numerical experiments, the authors change the optical properties of clouds by modifying the atmospheric water path, but only in the shortwave radiation scheme of the model. When Δα is varied from approximately −0.15 to 0.1, the east–west SST contrast in the equatorial Pacific reduces from 7.5°C to less than 1°C and the Walker circulation nearly collapses. These experiments reveal a near-linear dependence between Δα and the zonal temperature gradient, which generally agrees with results from the Coupled Model Intercomparison Project phase 5 (CMIP5) preindustrial control simulations. The authors explain the close relation between the two variables using an energy balance model incorporating the essential dynamics of the warm pool, cold tongue, and Walker circulation complex.</p>
FIG. 7 in A new platyrostrine sperm whale from the Early Miocene of the southeastern Pacific (East Pisco Basin, Peru) supports affinities with the southwestern Atlantic cetacean fauna
FIG. 7. — Cranium of Diaphorocetus poucheti (Moreno, 1892) MLP 5-6 (holotype) in dorsal (A), ventral (B), right lateral (C), and posterior (D) views, illustrating among others some diagnostic characters at the genus and species levels. The figured photos were taken by one of us (CM) in 1981, with a preservation state that is closer to the original illustrations in Lydekker (1893), prior to the separation of the right and left rostral parts and pterygoids/palatines from the neurocranium and with more complete antorbital notches and right orbit. Scale bar: 200 mm.
FIG. 4FIG. 4 in A new platyrostrine sperm whale from the Early Miocene of the southeastern Pacific (East Pisco Basin, Peru) supports affinities with the southwestern Atlantic cetacean fauna
FIG. 4FIG. 4. — Cranium of Diaphorocetus ortegai n. sp. MUSM 3246 (holotype, Chilcatay Formation, East Pisco Basin, Peru) in left (A) and right (B) lateral views. Black dashed lines for sutures, foramina, and outline of several bones and temporal fossa; red dashed line for posterior outline of supracranial basin. Scale bar: 200 mm.
FIG. 1 in A new platyrostrine sperm whale from the Early Miocene of the southeastern Pacific (East Pisco Basin, Peru) supports affinities with the southwestern Atlantic cetacean fauna
FIG. 1. — Geographic and geological setting. A, Location of the main outcrops of the Chilcatay Formation along the southern coast of Peru. B, Simplified map providing the position of Ullujaya (the type locality of Diaphorocetus ortegai n. sp.) alongside other highly fossiliferous sites of the Ica desert (including Zamaca, the type locality of Rhaphicetus valenciae Lambert, Muizon, Urbina & Bianucci, 2020). C, Schematic stratigraphic column of the Cenozoic succession exposed in the East Pisco Basin. D, Simplified stratigraphic section of the Chilcatay Formation in Ullujaya, showing the exact position of the holotype of D. ortegai n. sp. in the Ct1 allomember, Ct1a facies association. E, Simplified stratigraphic section of the Chilcatay Formation in Zamaca, showing the exact position of the holotype of R. valenciae in the Ct1 allomember, Ct1a facies association. Both sections D and E include positions of ash layers dated with 40Ar/39Ar and shell-rich beds dated with 87Sr/86Sr along with the corresponding age estimates (after Bosio et al. 2022). Maps and sections modified from Bianucci et al. (2018b), Di Celma et al. (2018, 2019), Bosio et al. (2020, 2022), and Lambert et al. (2020).
APPENDIX 5 in A new platyrostrine sperm whale from the Early Miocene of the southeastern Pacific (East Pisco Basin, Peru) supports affinities with the southwestern Atlantic cetacean fauna
APPENDIX 5. — Strict consensus of 15 most parsimonious trees resulting from the heuristic search performed with down-weighting of homoplastic characters (k = 3). Tree length 188; Goloboff fit -42.64; CI 0.45; RI 0.68.
FIG. 6 in A new platyrostrine sperm whale from the Early Miocene of the southeastern Pacific (East Pisco Basin, Peru) supports affinities with the southwestern Atlantic cetacean fauna
FIG. 6. — Cranium of Diaphorocetus ortegai n. sp. MUSM 3246 (holotype, Chilcatay Formation, East Pisco Basin, Peru) in right (A) and left (B) anterodorsolateral views. Black dashed lines for sutures, foramina, bony nares, and outline of several bones. Scale bar: 200 mm.
FIG. 3 in A new platyrostrine sperm whale from the Early Miocene of the southeastern Pacific (East Pisco Basin, Peru) supports affinities with the southwestern Atlantic cetacean fauna
FIG. 3. — Cranium of Diaphorocetus ortegai n. sp. MUSM 3246 (holotype, Chilcatay Formation, East Pisco Basin, Peru) in ventral view; photo and corresponding line drawing. Hatching for main break surfaces; black dashed lines for more tentative interpretations of sutures and edges. ali: alisphenoid. Scale bar: 200 mm.
FIG. 9 in A new platyrostrine sperm whale from the Early Miocene of the southeastern Pacific (East Pisco Basin, Peru) supports affinities with the southwestern Atlantic cetacean fauna
FIG. 9. — Comparison of the crania of Diaphorocetus ortegai n. sp. MUSM 3246 (holotype) (a, c) and Rhaphicetus valenciae Lambert, Muizon, Urbina & Bianucci, 2020 MUSM 2543 (holotype) (B, D), both from the Chilcatay Formation (East Pisco Basin, Peru), in dorsal (A, B) and right lateral (C, D) views, based on 3D models resulting from surface-scanning (see Appendices 1; 2), illustrating the difference in the cross-section of the maxillae on the rostrum (much more dorsoventrally flattened in D. ortegai n. sp.). Note that most of the premaxillae is lost on the rostrum of the holotype of D. ortegai n. sp., truncating the dorsal part of the anterior cross-sections. Scale bar: 200 mm.
FIG. 2 in A new platyrostrine sperm whale from the Early Miocene of the southeastern Pacific (East Pisco Basin, Peru) supports affinities with the southwestern Atlantic cetacean fauna
FIG. 2. — Cranium of Diaphorocetus ortegai n. sp. MUSM 3246 (holotype, Chilcatay Formation, East Pisco Basin, Peru) in dorsal view; photo and corresponding line drawing. Grey shading for sediment; hatching for main break surfaces; black dashed lines for more tentative interpretations of sutures and edges; and red dashed lines for posterior and lateral outlines of supracranial basin. Scale bar: 200 mm.
FIG. 5 in A new platyrostrine sperm whale from the Early Miocene of the southeastern Pacific (East Pisco Basin, Peru) supports affinities with the southwestern Atlantic cetacean fauna
FIG. 5. — Cranium of Diaphorocetus ortegai n. sp. MUSM 3246 (holotype, Chilcatay Formation, East Pisco Basin, Peru) in anterodorsal view (A) (photo and corresponding line drawing) and posterior view (B). Grey shading for sediment; hatching for main break surfaces; black dashed lines for more tentative interpretations of sutures and edges; red dashed lines for posterior outline of supracranial basin and outline of brain cavity. Scale bars: 200 mm.
Рис. 1. Размещение трансект (спΛошные черные Λинии) и Αаты провеΑения учетов в Охотском море и сопреΑеΛьных воΑах Тихого океана и Японского моря в февраΛе — мае 2020 г. РыбоΛовные районы: 05.1 — Северо-Охотоморская поΑзона; 05.2 — ЗапаΑно-Камчатская поΑзона; 05.3 — Восточно-СахаΛинская поΑзона; 05.4 — Камчатско-КуриΛьская поΑзона; 03 — Северо-КуриΛьская зона; 04 — Южно-КуриΛьская зона; 06 — зона Японское море. Пунктиром показана 200-метровая изобата Fig. 1. Transect locations (solid black lines) and dates of surveys in the Sea of Okhotsk and adjacent waters of the Pacific Ocean and the Sea of Japan in February–May 2020. Codes of the fishery areas are as follows: 05.1 — Northern Sea of Okhotsk Subzone; 05.2 — West Kamchatka Subzone; 05.3 — East Sakhalin Subzone; 05.4 — Kamchatka-Kuril Subzone; 03 — North Kuril Zone; 04 — South Kuril Zone; 06 — Sea of Japan Zone. Dotted line indicates a 200 m isobath in Population of seabirds in the Sea of Okhotsk and adjacent waters of the Pacific Ocean and the Sea of Japan during the winter-spring period of 2020
Рис. 1. Размещение трансект (спΛошные черные Λинии) и Αаты провеΑения учетов в Охотском море и сопреΑеΛьных воΑах Тихого океана и Японского моря в февраΛе — мае 2020 г. РыбоΛовные районы: 05.1 — Северо-Охотоморская поΑзона; 05.2 — ЗапаΑно-Камчатская поΑзона; 05.3 — Восточно-СахаΛинская поΑзона; 05.4 — Камчатско-КуриΛьская поΑзона; 03 — Северо-КуриΛьская зона; 04 — Южно-КуриΛьская зона; 06 — зона Японское море. Пунктиром показана 200-метровая изобата Fig. 1. Transect locations (solid black lines) and dates of surveys in the Sea of Okhotsk and adjacent waters of the Pacific Ocean and the Sea of Japan in February–May 2020. Codes of the fishery areas are as follows: 05.1 — Northern Sea of Okhotsk Subzone; 05.2 — West Kamchatka Subzone; 05.3 — East Sakhalin Subzone; 05.4 — Kamchatka-Kuril Subzone; 03 — North Kuril Zone; 04 — South Kuril Zone; 06 — Sea of Japan Zone. Dotted line indicates a 200 m isobath
Fig. 5 in Possible hybridization between East Pacific Green Chelonia mydas and Olive Ridley Lepidochelys olivacea sea turtles in northwest Mexico
Fig. 5. Healthy neonate turtles presenting characteristics of both East Pacific Green and Olive Ridley Turtles photographed before release. Photos by C.E. Hart (A) and F. Sanchez (B).
Fig. 6 in Possible hybridization between East Pacific Green Chelonia mydas and Olive Ridley Lepidochelys olivacea sea turtles in northwest Mexico
Fig. 6. Olive Ridley neonate from Nayarit with the commonly found coloration of fine white border to carapace and fore flippers. This coloration is not reported in the literature for this species. Photos by C.E. Hart.
Fig. 4 in Possible hybridization between East Pacific Green Chelonia mydas and Olive Ridley Lepidochelys olivacea sea turtles in northwest Mexico
Fig. 4. Deceased hatchling presenting (A) white coloration to the carapace and flipper border, and (B) the white plastron characteristic of East Pacific Green Turtles, while presenting (C) a typical Olive Ridley carapace and head. Photos by C.E. Hart.
Fig. 3 in Possible hybridization between East Pacific Green Chelonia mydas and Olive Ridley Lepidochelys olivacea sea turtles in northwest Mexico
Fig. 3. Embryo from an Olive Ridley nest, clearly displaying East Pacific Green Turtle coloration on both (A) plastron and flippers, and (B) carapace. Photos by C.E. Hart. Table 1. Morphological features of putative hybrid neonate turtles compared to those usually reported for Lepidochelys olivacea and Chelonia mydas.
Fig. 2 in Possible hybridization between East Pacific Green Chelonia mydas and Olive Ridley Lepidochelys olivacea sea turtles in northwest Mexico
Fig. 2. Carapace (A) and plastron (B) of Lepidochelys olivacea (L.o.) and Chelonia mydas (C.m.) hatchlings.
Fig. 1 in Possible hybridization between East Pacific Green Chelonia mydas and Olive Ridley Lepidochelys olivacea sea turtles in northwest Mexico
Fig. 1. Northwest Mexico. Circles denote nesting beaches where suspected hybrid hatchlings have been observed.
Linked collectors and determiners for: Syllidae (Annelida) from East Timor and the Philippines (Pacific Ocean), with the description of three new species of Syllis Savigny in Lamarck, 1818.
Natural history specimen data linked to collectors and determiners held within, "Syllidae (Annelida) from East Timor and the Philippines (Pacific Ocean), with the description of three new species of Syllis Savigny in Lamarck, 1818". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/f725a409-be04-4f11-b538-092af4454641">https://bionomia.net/dataset/f725a409-be04-4f11-b538-092af4454641</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/f725a409-be04-4f11-b538-092af4454641">https://gbif.org/dataset/f725a409-be04-4f11-b538-092af4454641</a>. Formatted as a Frictionless Data package.
Fig. 67 in New genera and new species of Hexapodidae (Crustacea, Brachyura) from the Indo-West Pacific and east Atlantic
Fig. 67. Theoxapus buchanani (Monod, 1956), holotype male (7.0 × 4.9 mm) (NHM 1957.12.4.29). A, overall view of carapace, chelipeds and P2–P4; B, ventral view of cephalothorax; C, frontal view of cephalothorax; D, chelae.
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