Earthquake with magnitude of Md 2.7 on date 20-04-1985 and time 00:35:25 (Italy) in region 4 km SW Stroncone (TR)

A magnitude Md 2.7 earthquake occured in region: 4 km SW Stroncone (TR), on

  • 19-04-1985 22:35:25 (UTC)
  • 20-04-1985 00:35:25 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.47, 12.63 at 7 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
Stroncone TR 4 4917 4917
Configni RI 6 633 5550
Cottanello RI 9 563 6113
Calvi dell'Umbria TR 10 1856 7969
Vacone RI 10 256 8225
Terni TR 10 111501 119726
Montasola RI 11 395 120121
Narni TR 11 19785 139906
Greccio RI 12 1558 141464
Montebuono RI 12 883 142347
Colli sul Velino RI 13 533 142880
Contigliano RI 13 3783 146663
Torri in Sabina RI 13 1256 147919
Tarano RI 13 1444 149363
Otricoli TR 14 1869 151232
Labro RI 15 374 151606
Casperia RI 15 1246 152852
Collevecchio RI 17 1577 154429
Arrone TR 17 2763 157192
Selci RI 17 1106 158298
San Gemini TR 17 5018 163316
Magliano Sabina RI 17 3774 167090
Morro Reatino RI 18 373 167463
Roccantica RI 18 563 168026
Montefranco TR 18 1276 169302
Cantalupo in Sabina RI 18 1685 170987
Rivodutri RI 19 1253 172240
Forano RI 20 3179 175419
Monte San Giovanni in Sabina RI 20 714 176133

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km S of Terni (111501 inhabitants)
44 Km E of Viterbo (67173 inhabitants)
53 Km N of Guidonia Montecelio (88673 inhabitants)
54 Km S of Foligno (57155 inhabitants)
58 Km N of Tivoli (56533 inhabitants)
64 Km W of L'Aquila (69753 inhabitants)
66 Km N of Roma (2864731 inhabitants)
73 Km S of Perugia (166134 inhabitants)
81 Km NE of Civitavecchia (52991 inhabitants)
84 Km NE of Fiumicino (78395 inhabitants)
88 Km N of Velletri (53303 inhabitants)
90 Km N of Pomezia (62966 inhabitants)
90 Km W of Teramo (54892 inhabitants)
98 Km N of Aprilia (73446 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 2.7 1985-04-19
22:35:25
42.47 12.63 7 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 4999
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-04-19 22:35:25 ± 0.385
Latitude 42.47 ± 0.01
Longitude 12.63 ± 0.03
Depth (km) 7 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 4999

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) 3172.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 186
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 17
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) 0.00081
Epicentral distance of station farthest from the epicenter (degree) 0.01036
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitude information

Md:2.7

Field Value
Value 2.7
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 4999
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:09:31
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.SD1.Z. 1985-04-19T22:36:03.50 10.0 undecidable manual SN 130 0.0104 -0.84 0.3
--.AR1.Z. 1985-04-19T22:36:02.00 10.0 undecidable manual SG 12 0.0094 0.38 0.6
--.CM2.Z. 1985-04-19T22:35:54.30 10.0 undecidable manual SG 27 0.0073 0.36 0.7
--.ALP.Z. 1985-04-19T22:35:52.70 10.0 undecidable manual SG 65 0.0067 0.62 0.6
--.RDP.Z. 1985-04-19T22:35:51.00 10.0 undecidable manual SG 174 0.0064 0.09 0.8
--.SD1.Z. 1985-04-19T22:35:49.00 10.0 undecidable manual PN 130 0.0104 1.14 0.5
--.AS1.Z. 1985-04-19T22:35:48.00 10.0 undecidable manual SG 1 0.0053 1.16 0.3
--.AR1.Z. 1985-04-19T22:35:47.50 10.0 undecidable manual PG 12 0.0094 1.21 0.5
--.ALP.Z. 1985-04-19T22:35:41.00 10.0 undecidable manual PG 65 0.0067 0.21 1.8
--.CM2.Z. 1985-04-19T22:35:40.90 10.0 undecidable manual PG 27 0.0073 -0.95 0.9
--.RDP.Z. 1985-04-19T22:35:39.00 10.0 undecidable manual PG 174 0.0064 -1.11 0.7
--.AQU.Z. 1985-04-19T22:35:37.50 10.0 undecidable manual PG 101 0.0052 -0.09 2
--.AS1.Z. 1985-04-19T22:35:36.80 10.0 undecidable manual PG 1 0.0053 -0.96 1
--.PO9.Z. 1985-04-19T22:35:34.50 10.0 undecidable manual SG 65 0.0022 -0.74 0.5
--.MNS.Z. 1985-04-19T22:35:31.00 10.0 undecidable manual SG 157 0.0008 1.33 0.3
--.PO9.Z. 1985-04-19T22:35:30.50 10.0 undecidable manual PG 65 0.0022 -0.56 1.6
--.MNS.Z. 1985-04-19T22:35:27.80 10.0 positive manual PG 157 0.0008 -0.05 4
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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