Earthquake with magnitude of Md 2.8 on date 25-02-1986 and time 22:21:54 (Italy) in region 3 km NW Castel Sant'Angelo (RI)

A magnitude Md 2.8 earthquake occured in region: 3 km NW Castel Sant'Angelo (RI), on

  • 25-02-1986 21:21:54 (UTC)
  • 25-02-1986 22:21:54 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.42, 13.02 at 5 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
Castel Sant'Angelo RI 3 1308 1308
Borgo Velino RI 4 972 2280
Micigliano RI 5 127 2407
Antrodoco RI 5 2588 4995
Cittaducale RI 6 6828 11823
Concerviano RI 11 291 12114
Cantalice RI 11 2755 14869
Rieti RI 13 47698 62567
Posta RI 14 694 63261
Petrella Salto RI 14 1197 64458
Poggio Bustone RI 14 2055 66513
Borbona RI 14 617 67130
Belmonte in Sabina RI 15 636 67766
Longone Sabino RI 17 597 68363
Leonessa RI 17 2435 70798
Rivodutri RI 17 1253 72051
Rocca Sinibalda RI 17 815 72866
Cagnano Amiterno AQ 18 1369 74235
Fiamignano RI 19 1413 75648
Morro Reatino RI 19 373 76021
Varco Sabino RI 20 187 76208

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km W of L'Aquila (69753 inhabitants)
34 Km E of Terni (111501 inhabitants)
52 Km NE of Guidonia Montecelio (88673 inhabitants)
53 Km NE of Tivoli (56533 inhabitants)
63 Km W of Teramo (54892 inhabitants)
65 Km SE of Foligno (57155 inhabitants)
73 Km NE of Roma (2864731 inhabitants)
75 Km E of Viterbo (67173 inhabitants)
84 Km N of Velletri (53303 inhabitants)
92 Km SE of Perugia (166134 inhabitants)
93 Km NE of Pomezia (62966 inhabitants)
94 Km W of Montesilvano (53738 inhabitants)
95 Km W of Chieti (51815 inhabitants)
96 Km NE of Fiumicino (78395 inhabitants)
96 Km NE of Aprilia (73446 inhabitants)
99 Km W of Pescara (121014 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 1986-02-25
21:21:54
42.42 13.02 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 23159
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1986-02-25 21:21:54 ± 0.363
Latitude 42.42 ± 0.02
Longitude 13.02 ± 0.03
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 23159

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) 3846.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 91
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) 0.00219
Epicentral distance of station farthest from the epicenter (degree) 0.01287
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:2.8

Field Value
Value 2.8
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 23159
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:25:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CRE.Z. 1986-02-25T21:22:22.00 10.0 undecidable manual PN 327 0.0129 1.05 0.5
--.RDP.Z. 1986-02-25T21:22:20.00 10.0 undecidable manual SG 198 0.0062 0.4 0.5
--.ARV.Z. 1986-02-25T21:22:17.00 10.0 undecidable manual PN 357 0.0097 0.85 0.8
--.ALP.Z. 1986-02-25T21:22:16.60 10.0 undecidable manual SG 47 0.0049 1.8 0.1
--.SD1.Z. 1986-02-25T21:22:14.00 10.0 undecidable manual PG 139 0.0083 0.84 0.9
--.ASS.Z. 1986-02-25T21:22:08.50 10.0 undecidable manual PG 337 0.0062 -0.55 1.2
--.RDP.Z. 1986-02-25T21:22:08.00 10.0 undecidable manual PG 198 0.0062 -0.97 0.8
--.ALP.Z. 1986-02-25T21:22:05.30 10.0 undecidable manual PG 47 0.0049 -1.16 1.3
--.MNS.Z. 1986-02-25T21:22:00.00 10.0 negative manual PG 262 0.0022 -0.08 2.9
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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