Earthquake
More extensive information will be added here - including tweets about this quake, lives affected (or lost), neighboring communities and cities affected, member comments, "who felt it", and more. Proximity and distance to the earthquake is already availble to logged-in members with an address on their profile. If the member is within 0-1000km of the earthquake, the distance matrix will calculate land transport distance and a the shortest distance between two points ( as the crow flies ). If the earthquake occurred at sea, nautical miles are also calculated.
Members who request notification will automatically receive an email and/or SMS text message for any earthquakes greater than 5.5. If the member adds family contact, the contact will be notified by email that "A Xm earthquake has occurred within Xkm of membername.". All notifications are on an opt-in basis. The IMOK feature will allow the member to single-click on their phone (or in the email) to quickly signal they are fine. IMOK is available for logged in members on an opt-in basis.
The 3D globe (right) will create two pins - one for the earthquake and one for the geographic location of the member viewing this page. If the visitor is not logged in, only one pin for the quake is rendered. The exact position of the moon at the time of the earthquake is included for your interest, and will display illumination %, phase, distance from Earth, the sun, and whether or not the moon was above (or below) the horizon. Some will argue the moon plays no role in influencing earthquakes, and some will argue the opposite. After all, the moon has an effect on tides. Either way, including the appearance of the moon at the exact time of the earthquake is extremely cool. Special thanks to the US Navy (military observatory) for making it possible.
Screenshot example displaying member's proximity:
Calculating
Array ( [type] => Feature [properties] => Array ( [mag] => 7.5 [place] => 72 km N of Palu, Indonesia [time] => 1538128965250 [updated] => 1702920163243 [tz] => [url] => https://earthquake.usgs.gov/earthquakes/eventpage/us1000h3p4 [felt] => 38 [cdi] => 8.6 [mmi] => 8.367 [alert] => red [status] => reviewed [tsunami] => 0 [sig] => 2033 [net] => us [code] => 1000h3p4 [ids] => ,us1000h3p4,iscgem616642238, [sources] => ,us,iscgem, [types] => ,dyfi,finite-fault,general-text,ground-failure,impact-text,losspager,moment-tensor,origin,phase-data,poster,shakemap, [nst] => [dmin] => 1.649 [rms] => 1 [gap] => 13 [magType] => mww [type] => earthquake [title] => M 7.5 - 72 km N of Palu, Indonesia [products] => Array ( [dyfi] => Array ( [0] => Array ( [indexid] => 24012954 [indexTime] => 1702920166810 [id] => urn:usgs-product:us:dyfi:us1000h3p4:1702920163243 [type] => dyfi [code] => us1000h3p4 [source] => us [updateTime] => 1702920163243 [status] => UPDATE [properties] => Array ( [depth] => 20 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The September 28, 2018, M 7.5 earthquake near Sulawesi, Indonesia occurred as a result of strike-slip faulting at shallow depths within the interior of the Molucca Sea microplate, part of the broader Sunda tectonic plate. Focal mechanism solutions for the earthquake indicate rupture occurred on either a left-lateral north-south striking fault, or along a right-lateral east-west striking fault. Eastern Indonesia is characterized by complex tectonics in which motions of numerous small microplates are accommodating large-scale convergence between the Australia, Sunda, Pacific, and Philippine Sea plates. At the location of the September 28th earthquake, the Sunda plate moves south with respect to Molucca Sea plate at a velocity of about 30 mm/year.
While commonly plotted as points on maps, earthquakes of this size are more appropriately described as slip over a larger fault area. Strike-slip events of the size of the September 28, 2018 earthquake are typically about 120x20 km in size (length x width); modeling of this earthquake implies dimensions of ~150x30 km, predominantly south of the hypocenter. Geodetic evidence (Pixel tracking and InSAR images) clearly show rupture (including surface rupture through the city of Palu) over a length of ~150 km.
Shallow earthquakes of this size can often have a deadly impact on nearby communities. Historically, this region has hosted several large earthquakes, with fifteen events of M 6.5 and larger within 250 km of the September 28th earthquake over the preceding century. The largest of these was a M 7.9 earthquake in January 1996, about 100 km to the north of the September 28, 2018 event. The 1996 earthquake – a shallow thrust faulting earthquake likely to have occurred on the regional subduction zone system at depth beneath the shallow crust - resulted in approximately 10 fatalities, over 60 injuries, and significant building damage in the local region. The September 28, 2018 earthquake was preceded by a series of small-to-moderate sized earthquakes over the hours leading up to this event; the USGS located 4 other earthquakes of M 4.9 and larger in the epicentral region, beginning with a M 6.1 earthquake three hours earlier and just to the south of the M 7.5 event. There has also been an active aftershock sequence, with 40 events of M 4.4 and larger in the first five days following this earthquake. The largest aftershock in this timeframe was M 5.8, about 12 minutes after the M 7.5 earthquake.
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The towns of Balaroa and Petobo were submerged due to liquefaction. A tsunami with an estimated wave height of 7 m was observed at Palu. Damage estimated at 911 million US dollars. 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