Earthquake with magnitude of Md 2.8 on date 23-04-1985 and time 16:54:20 (Italy) in region 3 km E L'Aquila (AQ)

A magnitude Md 2.8 earthquake occured in region: 3 km E L'Aquila (AQ), on

  • 23-04-1985 14:54:20 (UTC)
  • 23-04-1985 16:54:20 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.36, 13.44 at 10 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 8 721 70474
Ocre AQ 9 1167 71641
Poggio Picenze AQ 10 1136 72777
Sant'Eusanio Forconese AQ 11 394 73171
Lucoli AQ 11 1011 74182
San Demetrio ne' Vestini AQ 13 1854 76036
Villa Sant'Angelo AQ 13 424 76460
Tornimparte AQ 13 3187 79647
Barisciano AQ 13 1828 81475
Rocca di Cambio AQ 14 533 82008
Pizzoli AQ 14 4326 86334
Scoppito AQ 15 3727 90061
Barete AQ 16 737 90798
Fagnano Alto AQ 16 418 91216
Prata d'Ansidonia AQ 17 496 91712
Santo Stefano di Sessanio AQ 18 111 91823
Rocca di Mezzo AQ 18 1526 93349
San Pio delle Camere AQ 20 661 94010
Fontecchio AQ 20 369 94379

Municipalities with at least 50000 inhabitants

An earthquake occurred to
3 Km E of L'Aquila (69753 inhabitants)
40 Km SW of Teramo (54892 inhabitants)
60 Km W of Chieti (51815 inhabitants)
61 Km W of Montesilvano (53738 inhabitants)
65 Km W of Pescara (121014 inhabitants)
68 Km NE of Tivoli (56533 inhabitants)
68 Km E of Terni (111501 inhabitants)
71 Km NE of Guidonia Montecelio (88673 inhabitants)
89 Km SE of Foligno (57155 inhabitants)
92 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 2.8 1985-04-23
14:54:20
42.36 13.44 10 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 5349
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-04-23 14:54:20 ± 0.241
Latitude 42.36 ± 0.02
Longitude 13.44 ± 0.02
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 5349

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) 2623.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 143
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00016
Epicentral distance of station farthest from the epicenter (degree) 0.01069
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

Md:2.8

Field Value
Value 2.8
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 5349
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:09:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.AR1.Z. 1985-04-23T14:55:00.00 10.0 undecidable manual SN 342 0.0107 0.65 0.3
--.AS1.Z. 1985-04-23T14:54:52.00 10.0 undecidable manual SG 321 0.0082 0.5 0.4
--.CM2.Z. 1985-04-23T14:54:51.00 10.0 undecidable manual SG 345 0.0077 1.03 0.1
--.AR1.Z. 1985-04-23T14:54:42.00 10.0 undecidable manual PN 342 0.0107 -0.86 0.6
--.MNS.Z. 1985-04-23T14:54:40.50 10.0 undecidable manual SG 272 0.0049 0.28 0.7
--.AS1.Z. 1985-04-23T14:54:38.00 10.0 undecidable manual PG 321 0.0082 -0.33 1.4
--.PO9.Z. 1985-04-23T14:54:37.00 10.0 undecidable manual SG 300 0.0038 1.1 0.1
--.ALP.Z. 1985-04-23T14:54:36.50 10.0 undecidable manual SG 12 0.0039 0.27 0.9
--.CM2.Z. 1985-04-23T14:54:36.30 10.0 undecidable manual PG 345 0.0077 -1.14 0.3
--.SD1.Z. 1985-04-23T14:54:35.00 10.0 undecidable manual PG 156 0.0063 0.43 1.3
--.MNS.Z. 1985-04-23T14:54:31.00 10.0 undecidable manual PG 272 0.0049 -0.82 0.8
--.PO9.Z. 1985-04-23T14:54:29.50 10.0 undecidable manual PG 300 0.0038 0.18 1.7
--.ALP.Z. 1985-04-23T14:54:29.60 10.0 undecidable manual PG 12 0.0039 0.09 1.8
--.AQU.Z. 1985-04-23T14:54:22.50 10.0 negative manual PG 260 0.0002 0.16 3.5
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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