Historical eventOctober 152006

Seismic magnitude scales

The 6.7 Mw Kiholo Bay earthquake rocks Hawaii, causing property damage, injuries, landslides, power outages, and the closure of Honolulu International Airport.

20th anniversary in 2026

Everything on October 15Original source

In context

When
Sunday, October 15 200620 years ago
Category
Historical eventA dated happening — a battle, treaty, launch, discovery, disaster or decision — recorded on this calendar day.
Era
21st century · 2000s
Anniversary
20th in 2026
Recorded from
Wikipedia “On this day” feed

At a glance

Dates: From 2006.

What happened

Seismic magnitude scales are used to describe the overall strength or "size" of an earthquake. These are distinguished from seismic intensity scales that categorize the intensity or severity of ground shaking (quaking) caused by an earthquake at a given location. Magnitudes are usually determined from measurements of an earthquake's seismic waves as recorded on a seismogram. Magnitude scales vary based on what aspect of the seismic waves are measured and how they are measured.

October 15 through the years

Other entries on the same calendar day, in order.

  1. 2003Shenzhou 5
  2. 20062006 Kiholo Bay earthquake
  3. 2006Seismic magnitude scales
  4. 20072007 New Zealand police raids
  5. 2007New Zealand Police
  6. 2008Dow Jones Industrial Average
  7. 201115 October 2011 global protests
  8. 2013Seismic magnitude scales
  9. 20132013 Bohol earthquake
  10. 2016Montreal Protocol
  11. 2018Kidnapping of Jayme Closs

Also in 2006

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  • March 142006 Chadian coup attemptThe 2006 Chadian coup d'état attempt ends in failure.
  • March 14Operation Bringing Home the GoodsOperation Bringing Home the Goods: Israeli troops raid an American-supervised Palestinian prison in Jericho to capture six Palestinian pr…
  • September 17Fourpeaked MountainFourpeaked Mountain in Alaska erupts, marking the first eruption for the volcano in at least 10,000 years.
  • September 17Őszöd speechAn audio tape of a private speech by Hungarian Prime Minister Ferenc Gyurcsány is leaked to the public, in which he confessed that his Hu…
  • September 18The CWThe CW Television Network debuts in the US, following the merger of UPN and The WB.
  • September 5Waziristan AccordThe Waziristan Accord is signed between the Government of Pakistan and local Taliban militants in North Waziristan, obliging the Taliban…
  • October 22Panama Canal expansion projectA Panama Canal expansion proposal is approved by 77.8% of voters in a national referendum.

Everything we record for 2006 →

Sources

Cite this page

“Seismic magnitude scales”, What's On This Date, https://whatsonthisdate.com/app/event/seismic-magnitude-scales-2006-october-15, accessed October 27, 2026.

Cite the underlying source as well — the source links above go to the record this entry is adapted from.

Questions about this entry

When did Seismic magnitude scales happen?

October 15 2006 — 20 years ago, on a Sunday.

Where does this text come from?

Wikipedia “On this day” feed. Summaries are short adaptations that link back to the source, not reprints.

How do I cite this page?

Use the ready-made citation near the sources at the bottom of the page, and follow the source link to cite the underlying record as well.

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