Reauthorization of NEHRP

CRS report on the National Earthquake Hazard Reduction Program. Dec. 2018.

The federal government has supported efforts to assess and monitor earthquake hazards and risk in the United States under the National Earthquake Hazards Reduction Program (NEHRP) since 1977. Four federal agencies responsible for long – term earthquake risk reduction coordinate their activities under NEHRP.
U.S. Geological Survey (USGS)
National Science Foundation (NSF)
Federal Emergency Management Agency and
National Institute of Standards and Technology (NIST).

On November 27, 2018, Congress passed the National Earthquake Hazards Reduction Program Reauthorization Act of 2018 and sent the bill to President Trump on November 29. The 2018 NEHRP reauthorization act largely leaves the overall program structure in place, but modifies some of the intents and purposes of the original legislation, such as removing references to the goal of earthquake prediction, and substituting instead the goal of issuing early warnings and earthquake alerts. The new law also authorizes appropriations for NEHRP activities for each of the four NEHRP agencies through FY2023.

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Alaska Earthquake

The Anchorage Earthquake Was Terrifying. But the Damage Could’ve Been Much Worse.

Experts said that while the quake was significantly less intense than the one in 1964, which was magnitude 9.2, its limited destruction was the result of the region’s growing smarter and much more resilient in the years since. Anchorage was much better prepared for a major earthquake; other cities may not have fared so well.

The Diva looked for TV coverage of the earthquake, but there was little to see over the past few days.  News of the G20 Summit and the death of Pres. Bush got all the attention.

Complexities of Indonesia’s Disaster and Some Similarities in New Zealand

From Scientific American: Indonesian Tsunami Was Powered by a Deadly Combo of Tectonics and Geography. The magnitude 7.5 earthquake that touched off the tsunami occurred amid a complex puzzle of tectonic plates.

Thanks to Ian McLean of New Zealand for this citation. He says that NZ also has similar tectonic conditions.  Here are some of his observations about the seismic conditions and risk in New Zealand.

What I found particularly interesting was the fact that the earthquake occurred in a transition zone. To the west of this zone one plate subducts, and to the east of the zone the plates abut pushing up mountain ranges.

The configuration is similar to the zone in New Zealand where the Kaikoura sequence of earthquakes occurred.. To the north the Pacific plate subducts the Indo-Australian plate; and to the south the plates abut, pushing up the Southern Alps.

In the transition zone is a complex jumble of faults. Several of these ruptured sequentially during the Kaikoura sequence. The damage was unexpectedly severe, especially in Wellington.

But NZ  still awaits with apprehension earthquakes along the plate boundaries to the south and north of the transition zone. To the south , the Alpine fault has reached its mean return period. In the north, knowledge about the HIkurangi subduction zone was sparse, but substantial research is now being done.

Ian McLean is a former Chair of NZ Earthquake Commission, and has advised on catastrophe insurance schemes around the world, including helping to form the schemes in Turkey and Romania through the World Bank.

San Francisco’s Big Seismic Gamble

From the NYTimes: San Francisco’s Big Seismic Gamble

San Francisco lives with the certainty that the Big One will come. But the city is also putting up taller and taller buildings clustered closer and closer together because of the state’s severe housing shortage. Now those competing pressures have prompted an anxious rethinking of building regulations. Experts are sending this message: The building code does not protect cities from earthquakes nearly as much as you might think.

Progress in Predicting Major Earthquakes

Article on Predicting Major Earthquakes.

A Nagoya University-led team reveals the mechanisms behind different earthquakes at a plate boundary on the west coast of South America, shedding light on historical seismic events and providing a foundation for risk prediction tools to assess the likelihood of earthquakes and tsunamis striking this region and their potential periodicity and intensity.