Earthquake with magnitude of Md 2.3 on date 25-04-1986 and time 18:20:26 (Italy) in region 4 km W Montereale (AQ)

A magnitude Md 2.3 earthquake occured in region: 4 km W Montereale (AQ), on

  • 25-04-1986 16:20:26 (UTC)
  • 25-04-1986 18:20:26 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.53, 13.2 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
Montereale AQ 4 2581 2581
Borbona RI 6 617 3198
Capitignano AQ 8 665 3863
Cagnano Amiterno AQ 8 1369 5232
Posta RI 9 694 5926
Cittareale RI 10 482 6408
Barete AQ 11 737 7145
Pizzoli AQ 13 4326 11471
Amatrice RI 13 2657 14128
Campotosto AQ 14 542 14670
Micigliano RI 15 127 14797
Antrodoco RI 16 2588 17385
Scoppito AQ 18 3727 21112
Borgo Velino RI 18 972 22084
Accumoli RI 19 667 22751
Leonessa RI 20 2435 25186

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km NW of L'Aquila (69753 inhabitants)
43 Km W of Teramo (54892 inhabitants)
46 Km E of Terni (111501 inhabitants)
62 Km SE of Foligno (57155 inhabitants)
71 Km NE of Guidonia Montecelio (88673 inhabitants)
71 Km NE of Tivoli (56533 inhabitants)
78 Km W of Montesilvano (53738 inhabitants)
82 Km W of Chieti (51815 inhabitants)
83 Km W of Pescara (121014 inhabitants)
91 Km E of Viterbo (67173 inhabitants)
92 Km SE of Perugia (166134 inhabitants)
92 Km NE of Roma (2864731 inhabitants)
100 Km NE of Velletri (53303 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 2.3 1986-04-25
16:20:26
42.53 13.2 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 25999
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1986-04-25 16:20:26 ± 0.349
Latitude 42.53 ± 0.02
Longitude 13.20 ± 0.03
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 25999

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) 3075.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 151
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.6
Epicentral distance of station closest to the epicenter (degree) 0.00202
Epicentral distance of station farthest from the epicenter (degree) 0.00882
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:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 25999
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:27:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ARV.Z. 1986-04-25T16:20:59.50 10.0 undecidable manual SG 349 0.0088 -0.56 0.4
--.ASS.Z. 1986-04-25T16:20:49.50 10.0 undecidable manual SG 322 0.006 -0.36 0.6
--.ARV.Z. 1986-04-25T16:20:47.00 10.0 undecidable manual PG 349 0.0088 1.11 0.7
--.SD1.Z. 1986-04-25T16:20:46.00 10.0 undecidable manual PG 151 0.0084 1.01 0.7
--.MNS.Z. 1986-04-25T16:20:42.50 10.0 undecidable manual SG 249 0.0036 0.8 0.7
--.ASS.Z. 1986-04-25T16:20:40.00 10.0 undecidable manual PG? 322 0.006 0 0.8
--.MNS.Z. 1986-04-25T16:20:35.00 10.0 positive manual PG 249 0.0036 -0.28 3.4
--.AQU.Z. 1986-04-25T16:20:31.00 10.0 undecidable manual PG 140 0.002 -0.89 0.8
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download