Earthquake with magnitude of Md 2.4 on date 21-10-1985 and time 12:43:15 (Italy) in region 9 km NE L'Aquila (AQ)

A magnitude Md 2.4 earthquake occured in region: 9 km NE L'Aquila (AQ), on

  • 21-10-1985 11:43:15 (UTC)
  • 21-10-1985 12:43:15 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.39, 13.49 at 7 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
L'Aquila AQ 9 69753 69753
Poggio Picenze AQ 9 1136 70889
Barisciano AQ 11 1828 72717
Fossa AQ 11 721 73438
Sant'Eusanio Forconese AQ 12 394 73832
Ocre AQ 12 1167 74999
San Demetrio ne' Vestini AQ 13 1854 76853
Santo Stefano di Sessanio AQ 14 111 76964
Villa Sant'Angelo AQ 14 424 77388
Prata d'Ansidonia AQ 16 496 77884
Pietracamela TE 16 271 78155
Lucoli AQ 17 1011 79166
Fagnano Alto AQ 17 418 79584
Pizzoli AQ 17 4326 83910
Rocca di Cambio AQ 17 533 84443
Crognaleto TE 18 1297 85740
San Pio delle Camere AQ 18 661 86401
Calascio AQ 18 137 86538
Fano Adriano TE 18 296 86834
Barete AQ 19 737 87571
Castelvecchio Calvisio AQ 19 153 87724
Carapelle Calvisio AQ 19 87 87811
Isola del Gran Sasso d'Italia TE 19 4773 92584
Tornimparte AQ 19 3187 95771
Scoppito AQ 19 3727 99498
Castel del Monte AQ 20 413 99911
Fontecchio AQ 20 369 100280

Municipalities with at least 50000 inhabitants

An earthquake occurred to
9 Km NE of L'Aquila (69753 inhabitants)
35 Km SW of Teramo (54892 inhabitants)
56 Km W of Chieti (51815 inhabitants)
56 Km W of Montesilvano (53738 inhabitants)
60 Km W of Pescara (121014 inhabitants)
72 Km E of Terni (111501 inhabitants)
74 Km NE of Tivoli (56533 inhabitants)
77 Km NE of Guidonia Montecelio (88673 inhabitants)
90 Km SE of Foligno (57155 inhabitants)
98 Km NE of Velletri (53303 inhabitants)
100 Km NE of Roma (2864731 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 1000 Md 2.4 1985-10-21
11:43:15
42.39 13.49 7 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 14939
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-10-21 11:43:15 ± 0.746
Latitude 42.39 ± 0.04
Longitude 13.49 ± 0.07
Depth (km) 7 ± 4 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 14939

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 7113.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 180
Number of associated phases, regardless of their use for origin computation 9
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.7
Epicentral distance of station closest to the epicenter (degree) 0.00065
Epicentral distance of station farthest from the epicenter (degree) 0.01052
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

Md:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 14939
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:17:44
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.AR1.Z. 1985-10-21T11:43:54.50 10.0 undecidable manual SN 340 0.0105 0.09 0.5
--.SD1.Z. 1985-10-21T11:43:41.00 10.0 undecidable manual SG 160 0.0065 0.25 0.6
--.AR1.Z. 1985-10-21T11:43:37.50 10.0 undecidable manual PN 340 0.0105 -0.32 1.2
--.MNS.Z. 1985-10-21T11:43:37.50 10.0 undecidable manual SG 269 0.0053 0.68 0.2
--.AS1.Z. 1985-10-21T11:43:34.50 10.0 undecidable manual PG 317 0.0082 1.04 0.8
--.SD1.Z. 1985-10-21T11:43:30.00 10.0 undecidable manual PG 160 0.0065 0.07 1.7
--.MNS.Z. 1985-10-21T11:43:25.50 10.0 undecidable manual PG 269 0.0053 -2.16 0.3
--.AQU.Z. 1985-10-21T11:43:20.50 10.0 undecidable manual SG 240 0.0006 1.5 0.4
--.AQU.Z. 1985-10-21T11:43:17.00 10.0 positive manual PG 240 0.0006 -0.37 3.2
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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