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A new basin depth map of the fault-bound Wellington CBD based on residual gravity anomalies.

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Title: A new basin depth map of the fault-bound Wellington CBD based on residual gravity anomalies.
Authors: Stronach, Alistair1 (AUTHOR) alistair@stronach.co.nz, Stern, Tim1 (AUTHOR)
Source: New Zealand Journal of Geology & Geophysics. Mar2023, Vol. 66 Issue 1, p27-41. 15p.
Subjects: Gravity anomalies, Central business districts, Cannabidiol, Two-dimensional models
Geographic Terms: Wellington (N.Z.)
Abstract: A new basin depth map for the Wellington Central Business District shows a maximum depth of 540 m near the Wellington Stadium. Our new basin geometry constraints are from a residual gravity anomaly study, based on ∼600 new gravity observations. Residual gravity anomalies are as large as −6.2 mGal with uncertainties <0.1 mGal. Two-dimensional gravity models constrained by boreholes that intersect basement are used to generate the basin depth map. Our maximum depth is twice that previously estimated from other geological and geophysical criteria. An onshore extension of the recently discovered Aotea Fault on the western side of Mt Victoria, is also interpreted from the gravity data. A maximum basement offset of up to 130 m and gravity anomaly gradients up to 8 mGal/km are observed across the fault. A secondary splay off the main Aotea Fault is identified in the NW corner of Mt Victoria, and a possible extension to the Lambton Fault is identified beneath the Wellington Railway Station. This new basin depth and fault trace data provide valuable constraints to models of seismic hazard assessment for Wellington City. [ABSTRACT FROM AUTHOR]
Copyright of New Zealand Journal of Geology & Geophysics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 162103108
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
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  Data: A new basin depth map of the fault-bound Wellington CBD based on residual gravity anomalies.
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  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Stronach%2C+Alistair%22&quot;&gt;Stronach, Alistair&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;i&gt; alistair@stronach.co.nz&lt;/i&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Stern%2C+Tim%22&quot;&gt;Stern, Tim&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)
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  Data: &lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Gravity+anomalies%22&quot;&gt;Gravity anomalies&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Central+business+districts%22&quot;&gt;Central business districts&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Cannabidiol%22&quot;&gt;Cannabidiol&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Two-dimensional+models%22&quot;&gt;Two-dimensional models&lt;/searchLink&gt;
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  Data: &lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Wellington+%28N%2EZ%2E%29%22&quot;&gt;Wellington (N.Z.)&lt;/searchLink&gt;
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: A new basin depth map for the Wellington Central Business District shows a maximum depth of 540 m near the Wellington Stadium. Our new basin geometry constraints are from a residual gravity anomaly study, based on ∼600 new gravity observations. Residual gravity anomalies are as large as −6.2 mGal with uncertainties &lt;0.1 mGal. Two-dimensional gravity models constrained by boreholes that intersect basement are used to generate the basin depth map. Our maximum depth is twice that previously estimated from other geological and geophysical criteria. An onshore extension of the recently discovered Aotea Fault on the western side of Mt Victoria, is also interpreted from the gravity data. A maximum basement offset of up to 130 m and gravity anomaly gradients up to 8 mGal/km are observed across the fault. A secondary splay off the main Aotea Fault is identified in the NW corner of Mt Victoria, and a possible extension to the Lambton Fault is identified beneath the Wellington Railway Station. This new basin depth and fault trace data provide valuable constraints to models of seismic hazard assessment for Wellington City. [ABSTRACT FROM AUTHOR]
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  Label:
  Group: Ab
  Data: &lt;i&gt;Copyright of New Zealand Journal of Geology &amp; Geophysics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1080/00288306.2021.2000438
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 15
        StartPage: 27
    Subjects:
      – SubjectFull: Gravity anomalies
        Type: general
      – SubjectFull: Central business districts
        Type: general
      – SubjectFull: Cannabidiol
        Type: general
      – SubjectFull: Two-dimensional models
        Type: general
      – SubjectFull: Wellington (N.Z.)
        Type: general
    Titles:
      – TitleFull: A new basin depth map of the fault-bound Wellington CBD based on residual gravity anomalies.
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            NameFull: Stronach, Alistair
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            NameFull: Stern, Tim
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            – D: 01
              M: 03
              Text: Mar2023
              Type: published
              Y: 2023
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              Value: 66
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            – TitleFull: New Zealand Journal of Geology & Geophysics
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