The 2014 South Napa earthquake and its relevance for New Zealand
DOI:
https://doi.org/10.5459/bnzsee.48.1.1-30Abstract
The South Napa earthquake occurred on Sunday, 24 August 2014 at 3.20 am local time at a depth of 10.7 km, having MW 6.0 and causing significant damage to unreinforced masonry (URM) buildings in the City of Napa and generating strong ground shaking in a region well known for its wine production. Parallels exist between the damage in past New Zealand earthquakes, particularly to unreinforced masonry buildings, and the disruption in the Marlborough region following the recent 2013 MW 6.5 Seddon earthquake. Furthermore, the event was the largest to have occurred in Northern California since the 1989 Loma Prieta earthquake 25 years earlier, and hence was an important event for the local community of earthquake researchers and professionals regarding the use of a physical and virtual clearinghouse for data archiving of damage observations. Because numerous URM buildings in the City of Napa had been retrofitted, there was significant interest regarding the observed performance of different retrofitting methods.
Following a brief overview of the earthquake affected area and previous earthquakes to have caused damage in the Napa Valley region, details are provided regarding the characteristics of the 2014 South Napa earthquake, the response to the earthquake including placarding procedures and barricading, and more specific details of observed building and non-structural damage. Aspects of business continuity following the South Napa earthquake are also considered. One conclusion is that in general the seismic retrofitting of URM buildings in the Napa region proved to be very successful, and provides an important benchmark as New Zealand begins to more actively undertake seismic assessment and retrofitting of its earthquake prone building stock. It is also concluded that there are sufficient similarities between New Zealand and California, and a rich network of contacts that has developed following the hosting of many US visitors to New Zealand in conjunction with the 2010/2011 Canterbury earthquakes, that it is sensible for the New Zealand earthquake engineering community to maintain a close focus on ongoing earthquake preparedness and mitigation methods used and being developed in USA, and particularly in California.
References
MBIE (2014). “Field Guide: Rapid Post-Disaster Building Usability Assessment – Earthquake”. www.dbh.govt.nz/UserFiles/File/Publications/Building/pd bm/earthquake-field-guide.pdf. Accessed 2 February 2015.
Applied Technology Council. “Post-Earthquake Damage and Safety Evaluation of Buildings”. https://www.atcouncil.org/component/mijoshop/category/12-postearthquake-damage-and-safety-evaluation-of-buildings. Accessed 30 October 2014.
Wikipedia.“Napa, California”. http://en.wikipedia.org/wiki/Napa,_California. Accessed 16 September 2014.
United Stated Census Bureau. “Napa (City), California”. http://quickfacts.census.gov/qfd/states/06/0650258.html. Accessed 2 February 2015.
United Stated Census Bureau. “American Canyon (City), California”. http://quickfacts.census.gov/qfd/states/06/0601640.html. Accessed 2 February 2015.
Wikipedia. “American Canyon, California”. http://en.wikipedia.org/wiki/American_Canyon,_California. Accessed 16 September 2014.
United Stated Census Bureau. “Vallejo (City), California”. http://quickfacts.census.gov/qfd/states/06/0681666.html. Accessed 2 February 2015.
Wikipedia. “Vallejo, California”. http://en.wikipedia.org/wiki/Vallejo,_California. Accessed 16 September 2014.
Wikipedia. “Mare Island”. http://en.wikipedia.org/wiki/Mare_Island. Accessed 16 September 2014.
City of Napa. “The History of Napa”. http://www.cityofnapa.org/index.php?Itemid=300. Accessed 18 September 2014.
Calbricks. ‘California Bricks’. http://calbricks.netfirms.com/brick.jordanmare.html. Accessed 18 September 2014.
USGS. “Historic Earthquakes”. http://earthquake.usgs.gov/earthquakes/states/events/1898_03_31.php. Accessed 18 September 2014.
Vallejo Museum. “The Great Earthquake of 1906”. http://vallejomuseum.blogspot.com/2008/04/great-earthquake-of-1906.html. Accessed 18 September 2014.
Napa Valley Register. “1906: The Day the Earth Trembled in Napa”. http://napavalleyregister.com/news/local/the-day-the-earth-trembled-in-napa/article_8e5993fc-390a-11e3-8c73-0019bb2963f4.htm. Accessed 18 September 2014.
Wikipedia. “2000 Yountville Earthquake”. http://en.wikipedia.org/wiki/2000_Yountville_earthquake. Accessed 18 September 2014.
California Legislature (1986). “The URM Law”. Section 8875 et. seq., Government Code, California Statutes of 1986.
California Seismic safety Commission (2000). “Status of the Unreinforced Masonry Building Law”. 2000 Biennial Report to the Legislature. http://www.seismic.ca.gov/pub/CSSC_2000-02.pdf. Accessed 18 September 2014.
City of Vallejo (1990). “Vallejo Municipal Code Chapter 12.07: Seismic Hazard Identification and Mitigation Program for Unreinforced Masonry Buildings”. https://www.municode.com/library/ca/vallejo/codes/code_of_ordinances?nodeId=TIT12BUCO_CH12.07SEHAIDMIPRUNMABU_12.07.010FIDE. Accessed 30 October 2014.
Hoover CA (1992). “Seismic Retrofit Policies: An Evaluation of Local Practices in Zone 4 and their Application to Zone 3”. http://nisee.berkeley.edu/documents/elib/www//documents/201205/hoover-retrofit-policy.pdf. Accessed 2 February 2015.
California Seismic Safety Commission (2003). “Report to the Legislature - Status of the Unreinforced Masonry Building Law”. http://www.seismic.ca.gov/pub.html. Accessed 30 October 2014.
City of Napa (2006). ‘Napa Municipal Code Chapter 15.110: Review, Rehabilitation and Abatement of Existing Seismically Unsafe Buildings”. http://qcode.us/codes/napa/view.php?topic=15-15_110&frames=on. Accessed 30 October 2014.
Paxton B, Turner F, Elwood K and Ingham JM (2015). “URM Bearing Wall Building Seismic Risk Mitigation on the West Coast of the United States: A Review of Policies and Practices”, Bulletin of the NZ Society for Earthquake Engineering, 48(1): 31-40. DOI: https://doi.org/10.5459/bnzsee.48.1.31-40
Petaluma360.com. “Fault Suspected in Napa County Quake Fairly Obscure”. http://www.petaluma360.com/news/2581318-181/fault-suspected-in-napa-county. Accessed 16 September 2014.
Wikipedia. “2014 South Napa Earthquake”. http://en.wikipedia.org/wiki/2014_South_Napa_earthquake. Accessed 16 September 2014.
Wesling JR and Hanson KL (2008). “Mapping of the West Napa Fault Zone for Input into the Northern California Quaternary Fault Database”. http://earthquake.usgs.gov/research/external/reports/05HQAG0002.pdf. Accessed 30 October 2014.
Cao T, Bryant WA, Rowshandel B, Branum D and Wills CJ (2003). “The Revised 2002 California Probabilistic Seismic Hazard Maps”. California Geological Survey, http://www.consrv.ca.gov/CGS/rghm/psha/fault_parameters/pdf/2002_CA_Hazard_Maps.pdf. Accessed 30 October 2014.
Geotechnical Extreme Events Reconnaissance (2014). “August 24, 2014 South Napa, California Earthquake”. Report No. GEER-037, http://www.geerassociation.org/GEER_Post%20EQ%20Reports/SouthNapa_2014/index.html Accessed 30 October 2014.
Sowers JM, Noller JS and Lettis WR (1998). “Quaternary Geology and Liquefaction Susceptibility, Napa, California, 1:100,000 Quadrangle: A Digital Database”. US Geological Survey, Open File Report 98-460.
Knudson K, Sowers J, Witter R, Wentworth C and Helley E (2000). “Preliminary Maps of Quaternary Deposits and Liquefaction Susceptibility, Nine-County San Francisco Bay Region, California”. US Geological Survey Open file Report 00-444, V. 1.0. DOI: https://doi.org/10.3133/ofr00444
Eidinger J (2014). “South Napa M 6.0 Earthquake of August 24, 2014”. ASCE TCLEE Preliminary Reconnaissance Report, http://cms.asce.org/uploadedFiles/Technical_Groups_and_Institutes/TCLEE/NAPA2014ASCEFinal.pdf. Accessed 30 October 2014.
Levs J, Capelouto S and Berlinger J (2014). “Northern California Earthquake is Area's Strongest in 25 Years”. http://www.cnn.com/2014/08/24/us/california-earthquake/, Accessed 30 October 2014.
Brown C (2014). “Water Main Break Hindered Firefight Following Napa Quake”. http://sacramento.cbslocal.com/2014/08/24/water-main-break-complicated-firefight-following-napa-quake/. Accessed 31 October 2014.
Techel J and Ghilarducci M (2014). “2014 South Napa Earthquake Individual Assistance Supplemental Information”. www.countyofnapa.org/Individualassistance/. Accessed 31 October 2014.
Office of Governor Edmond G. Brown Jr. (2014). “Governor Brown Declares State of Emergency for South Napa Earthquake”. http://gov.ca.gov/news.php?id=18664. Accessed 30 October 2014.
Cal OES. “Safety Assessment Program (SAP)”. http://www.calema.ca.gov/recovery/pages/safety-assessment.aspx. Accessed 30 October 2014.
FEMA (2014). “President Declares Disaster for California”. http://www.fema.gov/news-release/2014/09/11/president-declares-disaster-california. Assessed 30 October 2014.
Wikipedia. “Good Samaritan Law”. http://en.wikipedia.org/wiki/Good_Samaritan_law . Assessed 30 October 2014.
City of Vallejo (2007). “Vallejo Municipal Code Chapter 12.05: Placards Used to Denote Conditions Related to Continued Occupancy of Buildings”. https://www.municode.com/library/ca/vallejo/codes/code_of_ordinances?nodeId=TIT12BUCO_CH12.052PLUSDECORECOOCBU_12.05.01IN. Accessed 30 October 2014.
Turner F (2013). “CalBO’s Interim Guidance for Barricading, Cordoning, Emergency Evaluation and Stabilization of Buildings with Substantial Damage in Disasters”. http://www.calbo.org/uploads/CALBOABMBarricadingEmergencyEvaluationandStabilizationofDamagedBuildings.pdf. Accessed 30 October 2014.
Russell AP and Ingham JM (2010). “Prevalence of New Zealand’s Unreinforced Masonry Buildings”. Bulletin of the New Zealand Society for Earthquake Engineering, 43(3): 182-201. DOI: https://doi.org/10.5459/bnzsee.43.3.182-201
Wikipedia. “Field Act”. http://en.wikipedia.org/wiki/Field_Act. Accessed 18 September 2014.
Turner F (2014). Personal Communication. 29 October 2014.
CBS (2014). “Teen Crushed by Collapsed Chimney in Napa Earthquake Recovering at UC Davis Hospital”. http://sanfrancisco.cbslocal.com/2014/08/25/teen-crushed-by-collapsed-chimney-in-napa-earthquake-recovering-at-uc-davis-hospital/. Accessed 18 September 2014.
California Building Standards Commission (2013). “2013 California Building Code. Appendix Chapter A1– Seismic Strengthening Provisions for Unreinforced Masonry Bearing Wall Buildings”. http://www.ecodes.biz/ecodes_support/free_resources/2013California/13Building/PDFs/Appendix%20Chapter%20A1%20-%20Seismic%20Strengthening%20Provisions.pdf. Accessed 3 February 2015.
The City and County of San Francisco (2007). “2007 San Francisco Building Code, Chapter 16C: Seismic Strengthening Provisions for Unreinforced Masonry Bearing Walls Buildings”.
California Seismic Safety Commission. “Failure of Wall Anchors during Earthquakes”. http://www.earthquakecountry.org/core/public/showcontext.php/2558/13550. Accessed 3 February 2015.
Wikipedia. “Sam Kee Laundry Building”. http://en.wikipedia.org/wiki/Sam_Kee_Laundry_Building. Accessed 31 October 2014.
Napa Valley Register (2010). “May Howard’s Brothel in the Sam Kee Laundry Building”. http://napavalleyregister.com/may-howard-s-brothel-in-the-sam-kee-laundry-building/image_7064d1e0-347c-11df-91b5-001cc4c002e0.html. Accessed 18 September 2014.
Synopsis Today (2014). “Quake-Hit Napa Starts Putting Things Back Together”. http://www.synopsis.today/news-special-reports/quake-hit-napa-starts-putting-things-back-together/. Accessed 18 September 2014.
Wikipedia (2014). “US Post Office (Napa, California)”. http://en.wikipedia.org/wiki/U.S._Post_Office_(Napa,_California). Accessed 31 October 2014.
Miranda E and Aslani H (2000). “Brief Report on the September 3, 2000 Yountville/Napa, California Earthquake”. Pacific Earthquake Engineering Research (PEER), http://peer.berkeley.edu/publications/yountville-napa_sep-2000.html. Accessed 16 September 2014.
Tremayne B (2014). Personal Communication. 30 October 2014.
Ho V (2014). “Woman Hit on Head by TV is 1st Napa Earthquake Death”. http://www.sfgate.com/bayarea/article/Woman-hit-by-TV-is-first-Napa-earthquake-death-5746343.php. Accessed 3 February 2015.
Caltrans (2014). “Post-Earthquake Investigation Team Report for the August 24, 2014 South Napa Earthquake”. http://www.dot.ca.gov/hq/esc/earthquake_engineering/damage_report/SouthNapaEQ-PEQITReport.pdf. Accessed 31 October 2014.
California Earthquake Authority (2014). “CEA Policyholders Already Submitting Claims for Damage to Homes from American Canyon Earthquake”. http://www.earthquakeauthority.com/UserFiles/File/Release/American%20Canyon%20Earthquake%20Release%20Aug%2024%202014.pdf. Accessed 31 October 2014.
Abkowitz A (2014). “Why 8 Out of 9 Californians Don't Buy Earthquake Insurance”. http://www.businessweek.com/articles/2014-08-25/88-percent-of-californians-dont-have-earthquake-insurance. Accessed 31 October 2014.
O’Conner L (2014). “More Than 90 Percent of Napa Residents Don't Have Earthquake Insurance: Report”. http://www.huffingtonpost.com/2014/08/25/napa-earthquake-insurance_n_5710739.html. Accessed 31 October 2014.
RMS (2014). “RMS Estimates Insured Losses from the South Napa, California Earthquake Will Not Exceed $250 Million”. http://www.rms.com/about/newsroom/press-releases/press-detail/2014-09-02/rms-estimates-insured-losses-from-the-south-napa-california-earthquake-will-not-exceed-250-million. Accessed 31 October 2014.
Stein J (2014). “A Quake Reminds Napa Winemakers of California's Faults”. http://www.businessweek.com/articles/2014-08-28/napa-winemakers-forgo-quake-insurance-face-cleanup-costs. Assessed 31 October 2014.
Franson P (2014). “Financial Impact of Napa Quake Rising”. http://www.winesandvines.com/template.cfm?section=news&content=138673. Accessed 31 October 2014.
McDonald C (2014). “Avoiding a Tragic Wine Crush: Seismic Expert Urges Safer Barrel-Stacking Method”. http://alumni.berkeley.edu/california-magazine/just-in/2014-09-10/avoiding-tragic-wine-crush-seismic-expert-urges-safer-barrel. Accessed 29 September 2014.
Marrow J (2002). “Experimental Studies on the Earthquake Performance of Wine Barrel Stacks”. Proceedings of the EERI 7th National Conference on Earthquake Engineering, Boston, Massachusetts, USA.
Bonné J (2014). “Winemakers Evaluate Napa Earthquake Damage”. http://www.sfgate.com/bayarea/article/Winemakers-evaluate-Napa-earthquake-damage-5708999.php#photo-6767334. Accessed 2 November 2014.
Puckette M (2014). “Earthquake Proof Your Wine”. http://winefolly.com/update/earthquake-proof-wine/. Accessed 2 November 2014.
Swindell B (2014). “Quake Damages Historic Napa Winery Building”. http://www.pressdemocrat.com/business/2594322-181/quake-damages-historic-napa-winery. Accessed 2 November 2014.
California Earthquake Clearing House (2009). “California Post-Earthquake Information Clearinghouse: Draft Operating Plan”. http://www.californiaeqclearinghouse.org/wp-content/uploads/2009/06/chplan090324.pdf. Accessed 18 September 2014.
Alfred E. Alquist Seismic Safety Commission (2014). “Impacts and Lessons Learned from the South Napa Earthquake”. http://www.seismic.ca.gov/minutes/2014_1008_Agenda.pdf. Accessed 11 February 2015.
Applied Technology Council (2014). “National Earthquake Technical Assistance Program (NETAP) Fiscal Year 2014”. https://www.atcouncil.org/36-projects/projects/258-atc-66-6-netap. Accessed 11 February 2015.
Applied Technology Council (2014). “FEMA P-1024, South Napa Earthquake Mitigation Report”. https://www.atcouncil.org/images/FEMAP1024Cover.pdf. Accessed 11 February 2015.
ASCE 41 (2013). “Seismic Evaluation and Retrofit of Existing Buildings”. http://dx.doi.org/10.1061/9780784412855. Assessed 11 February 2015. DOI: https://doi.org/10.1061/9780784412855