There have been 26 major aftershocks as of 2pm EST (18Z), all along the mountain ranges to the west of the earthquake epicenter. Some have been quite strong – two near the original quake were over m6.0. These are causing additional damage, probably additional casualties, as well as panic and disrupting rescue efforts. The initial impact estimate was close to $2 Billion; with each aftershock that number goes up, and is now pushing $2.5 Billion, with most of that in Nepal, but likely several hundred million in damage in neighboring India.
Overall economic impact to Nepal will easily exceed $1 Billion dollars, and impacts in India may exceed $500 Million. Here’s what the model spread looks like. Best estimate is $1.8 Billion, with much of the uncertainty is due to construction quality. Some scary but plausible scenarios are in the $6 Billion range, but the majority of models place impacts around $2 Billion:
Update: To put this in to context, the GDP of Nepal is about 66 Billion, so this event will be about 2% of GDP. Recent “bad” natural disasters impacting the US like Hurricanes Sandy and Katrina were in the $50 to $80 Billion range, but that is only 0.4 or 0.5 % of the US GDP. This earthquake would be a $320 Billion disaster in the US – something we’ve never experienced.
Early death reports are in the 500 range, but I would expect the final numbers to be well into the thousands.
This is a very vulnerable area, where the Indian subcontinent is ramming into Asia and uplifting the Himalaya Mountains, and previous severe earthquakes near Kathmandu have been devastating.
Most of the models indicated well under one million USD in damage, but a couple of the models showed over $5 Million in impacts; I doubt it was that high. There have been a number of quakes in this area recently. Strain building up, or being relieved? Hard to tell . . .
News Reports indicate it scared people but probably not a lot of damage. In my MIDGARD model suite of nine models, four were less than one million USD with a max of $5 Million.
Maysak should make landfall Sunday morning Philippines time (this evening US time) as a moderate tropical storm with peak winds around 55kts (63 mph, 100kph). Impacts look to be in the $30 to $40 million range – much, much less than the forecast indicated a few days ago. Here is the wind swath forecast using the latest JTWC track/intensity and my Taru model.
Very different impact forecast than yesterday, and yet another good example of the complexity of forecasting the impacts of natural hazards. The landfall intensity has decreased from 85 knots to 65 knots – a 25% decrease in wind speed. But the impact forecast dropped by nearly 90% to from over a Billion dollars to about $130 Million! Why? Because the amount of force the wind creates (the “dynamic pressure”) is related to the square of the wind speed, not the wind speed itself. So the pressure from a 65 knot wind is only 58% of the pressure of an 85 knot wind. But it’s a bit more complex than that, and damage relates to a number of complex factors that ends up being a higher power factor of the wind difference above a threshold. So for a typical house, an 85kt wind might cause 16% damage, whereas a 65 knot wind would only cause 4% damage. Another factor in this case is that the swath of damaging winds is smaller, and misses the densely populated areas near the Capital, Manila. Put all that together, and while the track doesn’t look that different, and the winds are a bit less, the damage forecast is dramatically different. Which is a good thing – the Philippines really doesn’t need another disaster given the last few years of Typhoons and earthquakes.
On this track, and using the JTWC forecast intensity at landfall of 85 knots, the storm could cause upwards of $1 Billion dollars in damage. For perspective, that is about 0.3% of GDP, or the equivalent of a $40 Billion dollar storm hitting the US. That is about the same damage as Hurricane Ike, which hit Texas in 2008, and is the third most expensive storm in US history. The Philippines has been hit be several intense storms the last few years, such as Haiyan in 2013 and Bopha in 2012 – in fact they have had 6 disasters that, in GDP equivalents, would have been worse than Hurricane Andrew, just since 2010. Bad Luck, or changing climate ?
Typhoon Maysak (WP042015) is a very powerful, 140kt/160mph/260kph storm, currently south of Guam. The Joint Typhoon Warning Center (JTWC) forecast track has it headed towards the northern Philippines:
On this track it would make landfall with winds at around 95kts/180kph, and cause between $500 Million and a Billion dollars in damage. Last year JTWC’s intensity forecasts were not so great. The objective models, and the Japan Meteorological Agency Ensemble (pink line) forecasts also show the storm striking the northern Philippines:
The JMA Ensemble forecast has a weaker storm, only 80 knots at landfall. 80 vs 95 may not seem as much, but an 80knot wind only has 70% of the energy of a 95 knot wind; big difference in damage.
Nothing in the way, no damage forecast. It’s a bit unusual for this time of year, but our good records of the Pacific only go back to the 1940’s, so it’s a bit hard to draw any conclusions from this. This is the second North West Pacific storm (the WP022015 designation is the Joint Typhoon Warning Center tracking number – WP is West Pacific, 02 is the second storm, 2015 the year).