Earthquake with magnitude of Md 2.6 on date 23-04-1985 and time 10:57:25 (Italy) in region 6 km E Antrodoco (RI)

A magnitude Md 2.6 earthquake occured in region: 6 km E Antrodoco (RI), on

  • 23-04-1985 08:57:25 (UTC)
  • 23-04-1985 10:57:25 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.44, 13.15 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
Antrodoco RI 6 2588 2588
Cagnano Amiterno AQ 7 1369 3957
Micigliano RI 8 127 4084
Borgo Velino RI 8 972 5056
Borbona RI 9 617 5673
Barete AQ 11 737 6410
Castel Sant'Angelo RI 11 1308 7718
Posta RI 11 694 8412
Scoppito AQ 11 3727 12139
Pizzoli AQ 12 4326 16465
Montereale AQ 13 2581 19046
Capitignano AQ 16 665 19711
Petrella Salto RI 17 1197 20908
Cittaducale RI 18 6828 27736
Concerviano RI 18 291 28027
Fiamignano RI 19 1413 29440

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km W of L'Aquila (69753 inhabitants)
44 Km E of Terni (111501 inhabitants)
52 Km W of Teramo (54892 inhabitants)
60 Km NE of Guidonia Montecelio (88673 inhabitants)
60 Km NE of Tivoli (56533 inhabitants)
69 Km SE of Foligno (57155 inhabitants)
82 Km NE of Roma (2864731 inhabitants)
82 Km W of Montesilvano (53738 inhabitants)
84 Km W of Chieti (51815 inhabitants)
86 Km E of Viterbo (67173 inhabitants)
87 Km W of Pescara (121014 inhabitants)
89 Km NE of Velletri (53303 inhabitants)
97 Km SE of Perugia (166134 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 2.6 1985-04-23
08:57:25
42.44 13.15 10 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 5339
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-04-23 08:57:25 ± 0.357
Latitude 42.44 ± 0.02
Longitude 13.15 ± 0.03
Depth (km) 10 ± 10 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 5339

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) 3546.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 116
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
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) 0.00178
Epicentral distance of station farthest from the epicenter (degree) 0.00963
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

Md:2.6

Field Value
Value 2.6
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 5339
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
--.CM2.Z. 1985-04-23T08:57:51.10 10.0 undecidable manual SG 359 0.0068 -0.23 0.7
--.AR1.Z. 1985-04-23T08:57:46.50 10.0 undecidable manual PN 352 0.0096 0.6 0.7
--.SD1.Z. 1985-04-23T08:57:45.00 10.0 undecidable manual PG? 145 0.0079 2.56 0
--.AS1.Z. 1985-04-23T08:57:40.00 10.0 undecidable manual PG 330 0.0065 0.32 1.1
--.CM2.Z. 1985-04-23T08:57:39.30 10.0 positive manual PG 359 0.0068 -0.95 0.5
--.MNS.Z. 1985-04-23T08:57:37.50 10.0 undecidable manual SG 262 0.0032 -0.78 0.3
--.PO9.Z. 1985-04-23T08:57:34.00 10.0 undecidable manual SG 312 0.0019 0.29 0.8
--.AQU.Z. 1985-04-23T08:57:33.00 10.0 undecidable manual SG 113 0.0018 -0.5 0.5
--.MNS.Z. 1985-04-23T08:57:32.30 10.0 positive manual PG 262 0.0032 -0.41 2.6
--.PO9.Z. 1985-04-23T08:57:30.50 10.0 undecidable manual PG 312 0.0019 0.43 2.5
--.AQU.Z. 1985-04-23T08:57:29.50 10.0 undecidable manual PG 113 0.0018 -0.46 1.2
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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