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Lidar reveals uniform Alpine fault offsets and bimodal plate boundary rupture behavior, New Zealand

2014; Geological Society of America; Volume: 42; Issue: 5 Linguagem: Inglês

10.1130/g35100.1

1943-2682

Gregory P. De Pascale, Mark Quigley, Tim Davies,

Geological and Geochemical Analysis

Research Article| May 01, 2014 Lidar reveals uniform Alpine fault offsets and bimodal plate boundary rupture behavior, New Zealand Gregory P. De Pascale; Gregory P. De Pascale * Department of Geological Sciences, University of Canterbury, Christchurch 8140, New Zealand *Current address: Fugro Geotechnical (NZ), Middleton, Christchurch 8024, New Zealand; E-mail: snowyknight@gmail.com. Search for other works by this author on: GSW Google Scholar Mark C. Quigley; Mark C. Quigley Department of Geological Sciences, University of Canterbury, Christchurch 8140, New Zealand Search for other works by this author on: GSW Google Scholar Tim R.H. Davies Tim R.H. Davies Department of Geological Sciences, University of Canterbury, Christchurch 8140, New Zealand Search for other works by this author on: GSW Google Scholar Author and Article Information Gregory P. De Pascale * Department of Geological Sciences, University of Canterbury, Christchurch 8140, New Zealand Mark C. Quigley Department of Geological Sciences, University of Canterbury, Christchurch 8140, New Zealand Tim R.H. Davies Department of Geological Sciences, University of Canterbury, Christchurch 8140, New Zealand *Current address: Fugro Geotechnical (NZ), Middleton, Christchurch 8024, New Zealand; E-mail: snowyknight@gmail.com. Publisher: Geological Society of America Received: 09 Sep 2013 Revision Received: 12 Feb 2014 Accepted: 17 Feb 2014 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2014 Geological Society of America Geology (2014) 42 (5): 411–414. https://doi.org/10.1130/G35100.1 Article history Received: 09 Sep 2013 Revision Received: 12 Feb 2014 Accepted: 17 Feb 2014 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Gregory P. De Pascale, Mark C. Quigley, Tim R.H. Davies; Lidar reveals uniform Alpine fault offsets and bimodal plate boundary rupture behavior, New Zealand. Geology 2014;; 42 (5): 411–414. doi: https://doi.org/10.1130/G35100.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Analysis of light detection and ranging (lidar) derived topography combined with field data enables measurement of small (<30 m), previously unrecognized dextral offsets beneath dense temperate rainforest along New Zealand's central Alpine fault. Field offset measurements often have lower uncertainties than lidar measurements. Offsets of 7.5 ± 1 m for the most recent earthquake (ca. A.D. 1717) and cumulative offsets of 12.9 ± 2 m and 22 ± 2.7 m can be averaged into three 7.1 ± 2.1 m increments of repeated dextral slip at a point, and when combined with an offset compilation show a uniform slip distribution of ∼7.5 ± 2.0 m over 300 km in A.D. 1717. Comparing these offsets with the 1.1 ka paleoseismic record and slip rate demonstrates a mismatch between offsets, timing, and slip rate that can be explained in two ways: (1) major (full) ruptures (moment magnitude, Mw ≥7.9) every 270 ± 70 yr (e.g., A.D. 1717) and with moderate to large (partial rupture) Alpine fault earthquakes (Mw ≥6.5; e.g., A.D. 1600) occurring between full ruptures, and (2) some off-fault shaking data may instead reflect paleoseismicity from other faults. If explanation 1 is true, the Alpine fault has two (i.e., bimodal) or more modes of behavior (or the slip rate has not been constant since 1.1 ka) and rupture is perhaps width limited. If explanation 2 is true, perhaps the Alpine fault behavior is characteristic, and other faults are responsible for some shaking records. Ultimately, bimodal behavior is our preferred interpretation, which has implications for our understanding of plate boundary seismic hazards worldwide. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.