SAN FRANCISCO in a Magnitude 10 EARTHQUAKE

The Lord Judges the Nations

Jol 3:1  For, behold, in those days, and in that time, when I shall bring again the captivity of Judah and Jerusalem,

Jol 3:2  I will also gather all nations, and will bring them down into the valley of Jehoshaphat, and will plead with them there for my people and for my heritage Israel, whom they have scattered among the nations, and parted my land.

Jol 3:3  And they have cast lots for my people; and have given a boy for an harlot, and sold a girl for wine, that they might drink.

Jol 3:4  Yea, and what have ye to do with me, O Tyre, and Zidon, and all the coasts of Palestine? will ye render me a recompence? and if ye recompense me, swiftly and speedily will I return your recompence upon your own head;

Jol 3:5  Because ye have taken my silver and my gold, and have carried into your temples my goodly pleasant things:

Jol 3:6  The children also of Judah and the children of Jerusalem have ye sold unto the Grecians, that ye might remove them far from their border.

Jol 3:7  Behold, I will raise them out of the place whither ye have sold them, and will return your recompence upon your own head:

Jol 3:8  And I will sell your sons and your daughters into the hand of the children of Judah, and they shall sell them to the Sabeans, to a people far off: for the LORD hath spoken it.

Jol 3:9  Proclaim ye this among the Gentiles; Prepare war, wake up the mighty men, let all the men of war draw near; let them come up:

Jol 3:10  Beat your plowshares into swords, and your pruninghooks into spears: let the weak say, I am strong.

Jol 3:11  Assemble yourselves, and come, all ye heathen, and gather yourselves together round about: thither cause thy mighty ones to come down, O LORD.

Jol 3:12  Let the heathen be wakened, and come up to the valley of Jehoshaphat: for there will I sit to judge all the heathen round about.

Jol 3:13  Put ye in the sickle, for the harvest is ripe: come, get you down; for the press is full, the fats overflow; for their wickedness is great.

Jol 3:14  Multitudes, multitudes in the valley of decision: for the day of the LORD is near in the valley of decision.

Jol 3:15  The sun and the moon shall be darkened, and the stars shall withdraw their shining.

Jol 3:16  The LORD also shall roar out of Zion, and utter his voice from Jerusalem; and the heavens and the earth shall shake: but the LORD will be the hope of his people, and the strength of the children of Israel.

The Glorious Future of Judah

Jol 3:17  So shall ye know that I am the LORD your God dwelling in Zion, my holy mountain: then shall Jerusalem be holy, and there shall no strangers pass through her any more.

Jol 3:18  And it shall come to pass in that day, that the mountains shall drop down new wine, and the hills shall flow with milk, and all the rivers of Judah shall flow with waters, and a fountain shall come forth of the house of the LORD, and shall water the valley of Shittim.

Jol 3:19  Egypt shall be a desolation, and Edom shall be a desolate wilderness, for the violence against the children of Judah, because they have shed innocent blood in their land.

Jol 3:20  But Judah shall dwell for ever, and Jerusalem from generation to generation.

Jol 3:21  For I will cleanse their blood that I have not cleansed: for the LORD dwelleth in Zion.

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Important context: Moment Magnitude (Mw) is logarithmic—each whole step is ~32× more energy.
An Mw 10.0 would release roughly 1,000,000× the energy of an Mw 6.0 and ~32× the largest recorded quake (Mw 9.5, Chile 1960). A fault long enough to generate an Mw 10 does not exist on Earth; this page explores a hypothetical scenario to underline realistic preparedness.

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First, why a Magnitude 10 is so extreme

  • M6.0 (e.g., 2014 Napa): ~Hiroshima bomb energy scale.
  • M7.0: ~32× M6.0.
  • M8.0 (1906 SF ≈ M7.9): ~1,000× M6.0.
  • M9.0 (2011 Tōhoku): ~32,000× M6.0.
  • M10.0: ~1,000,000× M6.0; ~32× the largest recorded (M9.5, 1960 Chile).

A fault capable of Mw 10 does not exist on Earth. The San Andreas Fault’s maximum is ~Mw 8.3; the Cascadia Subduction Zone is estimated around ~Mw 9.2+. USGS context

Detailed Scenario: The Unthinkable Becomes Real

Assume a hypothetical, previously unknown subduction zone fractures along a 2,000+ mile line off California, triggering an Mw 10 event. This is a thought experiment to illuminate risk—not a realistic forecast.

Phase 1: The Shaking (Minutes 0–30)

Intensity & duration: Modified Mercalli Intensity XII (Extreme): “Damage total. Waves seen on ground surfaces… Objects thrown upward.” Violent ruptures for 20–30 minutes.

Liquefaction: USGS liquefaction susceptibility maps indicate widespread failure in “High” and “Moderate” zones in such a scenario.

  • Marina & Financial District: Echoes of 1989 Loma Prieta liquefaction, but far more severe—tilting, sinking, pancaking of multi-story buildings.
  • SoMa, Mission Bay, Treasure Island, SFO: Built on bay fill; ground failure would tear apart foundations and critical infrastructure.

Phase 2: The Structural Collapse (Minutes 5–60)

Building stock:

  • URM (Unreinforced Masonry): ~2,400 buildings in SF; near-total collapse likely.
  • Soft-story apartments: Widespread failures of “tuck-under” parking structures.
  • Modern skyscrapers: Designed for rare, intense shaking (~2,500-yr events), not an Mw 10 (~100,000-yr realm). Expect severe core/connection failures and full facade glass loss; even icons (Transamerica Pyramid, Salesforce Tower) face high risk of partial/total collapse.

Infrastructure:

  • Bridges: Bay Bridge approaches and tunnel vulnerable; Golden Gate Bridge severely tested beyond design basis; freeway overpasses (I-80, I-280, US-101) collapse likely.
  • Utilities: Hetch Hetchy system and local mains sheared in many locations; little to no water for drinking or firefighting.

Phase 3: The Cascading Disasters (Minutes 30 – Days 7)

Tsunami: Massive vertical seafloor displacement expected. If an Mw 9 Cascadia can send 20–40 ft waves to NorCal, an Mw 10 would exceed this. Through the Golden Gate, funneling could still produce ~30–50 ft within the Bay.

  • Inundation across the Embarcadero, Oracle Park, Mission Bay, Oakland Intl., Alameda, parts of Richmond/San Rafael.

Fires: Gas breaks + electrical faults ignite thousands of blazes. With water systems down, a firestorm could burn for weeks.

Phase 4: The Aftermath & Human Toll (Days 7+)

  • Casualties: With >1M daytime population, combined effects (collapse, tsunami, fires, landslides) imply several hundred thousand fatalities and severe injuries; many trapped pockets.
  • Societal breakdown: Bridges, BART, airports, port compromised; emergency services overwhelmed; shortages and disease risks rise.
  • Regional/national impact: Severe economic shock with global ramifications.

Conclusion: Beyond a “Disaster”

An Mw 10 under/near San Francisco is effectively apocalyptic and not a realistic seismic threat. But the lesson is clear: prepare for realistic major earthquakes (Mw 7–8 range) via retrofits, lifeline upgrades, and personal/community readiness. That’s not overreaction—it’s prudent risk management in earthquake country.

Further Preparedness & Scientific Reading

Disclaimer: This page presents a hypothetical Mw 10 scenario for educational purposes. It does not represent an official forecast. Always consult official sources (USGS, CGS, FEMA) for current guidance.

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