Earthquake with magnitude of Md 2.5 on date 22-02-1985 and time 20:19:32 (Italy) in region 3 km NE L'Aquila (AQ)

A magnitude Md 2.5 earthquake occured in region: 3 km NE L'Aquila (AQ), on

  • 22-02-1985 19:19:32 (UTC)
  • 22-02-1985 20:19:32 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.38, 13.42 at 24 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 3 69753 69753
Fossa AQ 11 721 70474
Ocre AQ 11 1167 71641
Poggio Picenze AQ 12 1136 72777
Lucoli AQ 12 1011 73788
Pizzoli AQ 13 4326 78114
Sant'Eusanio Forconese AQ 13 394 78508
Scoppito AQ 14 3727 82235
Tornimparte AQ 14 3187 85422
Barete AQ 14 737 86159
Barisciano AQ 15 1828 87987
San Demetrio ne' Vestini AQ 15 1854 89841
Villa Sant'Angelo AQ 15 424 90265
Rocca di Cambio AQ 16 533 90798
Fagnano Alto AQ 18 418 91216
Prata d'Ansidonia AQ 19 496 91712
Santo Stefano di Sessanio AQ 19 111 91823
Cagnano Amiterno AQ 19 1369 93192
Capitignano AQ 19 665 93857
Crognaleto TE 20 1297 95154
Pietracamela TE 20 271 95425

Municipalities with at least 50000 inhabitants

An earthquake occurred to
3 Km NE of L'Aquila (69753 inhabitants)
39 Km SW of Teramo (54892 inhabitants)
61 Km W of Chieti (51815 inhabitants)
62 Km W of Montesilvano (53738 inhabitants)
66 Km W of Pescara (121014 inhabitants)
67 Km E of Terni (111501 inhabitants)
69 Km NE of Tivoli (56533 inhabitants)
71 Km NE of Guidonia Montecelio (88673 inhabitants)
87 Km SE of Foligno (57155 inhabitants)
93 Km NE of Velletri (53303 inhabitants)
94 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 2.5 1985-02-22
19:19:32
42.38 13.42 24 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 2229
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-02-22 19:19:32 ± 0.488
Latitude 42.38 ± 0.04
Longitude 13.42 ± 0.04
Depth (km) 24 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 2229

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) 5651
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 230
Number of associated phases, regardless of their use for origin computation 7
Number of defining phases 7
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.00024
Epicentral distance of station farthest from the epicenter (degree) 0.00753
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitude information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 2229
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CM8.Z. 1985-02-22T19:20:00.10 10.0 undecidable manual SN 345 0.0075 0.31 0.7
--.PO9.Z. 1985-02-22T19:19:47.50 10.0 undecidable manual SG 299 0.0036 -0.36 0.6
--.CM8.Z. 1985-02-22T19:19:47.20 10.0 undecidable manual PN 345 0.0075 -0.84 0.7
--.MNS.Z. 1985-02-22T19:19:43.50 10.0 undecidable manual PG 271 0.0049 -0.13 1.7
--.PO9.Z. 1985-02-22T19:19:42.00 10.0 undecidable manual PG 299 0.0036 0.84 0.9
--.AQU.Z. 1985-02-22T19:19:39.00 10.0 undecidable manual SG 216 0.0002 -0.64 0.8
--.AQU.Z. 1985-02-22T19:19:36.80 10.0 undecidable manual PG 216 0.0002 0.38 1.7
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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