Well gonna admit to some second thoughts here. Probably a little bit of exploring will find a couple pre-school aged kids hiding in an alley, for example, parents maybe dead. Lots of small family groups in desperate straights. I personally couldn't morally walk away, with the skills I have, and leave them to die. In Japan they have disasters like this every year or two, quakes, tsunamis, typhoons, etc, and they have built up a tremendous amount of infrastructure and agencies to deal with it. They call it BOSAI, science that can save your life. Unfortunately our government just squanders the 'infrastructure' funds on pork (not the edible type), and sells of our strategic petroleum reserve to China. Nevertheless, the national guard, military, etc. are setup to respond to disasters and they have a tremendous amount of resources. Stockpiles of food, hospital ships, floating bridges, etc. Seems that a partnership between them, medical personnel, power companies, religious organizations, farmers, engineers etc. could start to rebuild, just like MacArthur rebuilt Japan after the war. Short term would be basic food and shelter, immediately transitioning to rebuilding, with able bodied adults using their skills as needed, or just labor. Orchards should be bearing OK, crops should be plantable (for food instead of turning petro-based fertilizer into ethanol at a net loss), and non-petro based farming. I get all the water for our garden and trees from rain gutters diverted into cisterns. Diesels can burn vegetable oil and, in fact, diesels in tropical areas are almost entirely fueled by coconut oil (too thick in colder areas). Priorities would also be to get pharma companies back up and running.
One issue Japan has is the lopsided population. The last quake a few weeks ago hit a rural area, with most of the residents over 50 or 60 years old, many up to 90 years old. With roads completely demolished, they had to resort to circling around and approaching by sea. The birth rate in Japan is so low there isn't any base to support the elderly, and there won't be anybody left by 2050 or so, and they are paying couples to have children. China is doing the same thing.
Recently, tagged white sharks were found crossing the Pacific and swimming to depths of 10,000 - 20,000 feet. Why? It is completely packed with seafood of all types and sizes - enough to support hundreds of billions of people. I think that type of resource should be developed today, not when it is too late.
Here is a direct example of Japanese tech at work on solar flares:
Solar Flare Prediction in Japan BOSAI
A dozen or more other types of disasters and mitigation efforts can be found on this channel as well.