Earthquake with magnitude of Md 2.6 on date 18-03-1985 and time 01:19:55 (Italy) in region 2 km E Onano (VT)

A magnitude Md 2.6 earthquake occured in region: 2 km E Onano (VT), on

  • 18-03-1985 00:19:55 (UTC)
  • 18-03-1985 01:19:55 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7, 11.84 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
Onano VT 2 995 995
Grotte di Castro VT 4 2683 3678
Acquapendente VT 6 5506 9184
San Lorenzo Nuovo VT 6 2091 11275
Gradoli VT 6 1353 12628
Proceno VT 7 557 13185
Latera VT 8 836 14021
Sorano GR 10 3428 17449
Castel Giorgio TR 12 2131 19580
Bolsena VT 14 3991 23571
Castell'Azzara GR 14 1476 25047
Valentano VT 14 2868 27915
Castel Viscardo TR 15 2938 30853
Pitigliano GR 16 3818 34671
Allerona TR 17 1794 36465
Capodimonte VT 18 1731 38196
Ischia di Castro VT 18 2326 40522
Farnese VT 19 1527 42049
San Casciano dei Bagni SI 20 1632 43681
Marta VT 20 3499 47180
Piansano VT 20 2079 49259

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km NW of Viterbo (67173 inhabitants)
60 Km E of Grosseto (82087 inhabitants)
64 Km SW of Perugia (166134 inhabitants)
68 Km N of Civitavecchia (52991 inhabitants)
68 Km W of Terni (111501 inhabitants)
76 Km W of Foligno (57155 inhabitants)
80 Km SE of Siena (53903 inhabitants)
86 Km S of Arezzo (99543 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 1985-03-18
00:19:55
42.7 11.84 5 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 3329
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-03-18 00:19:55 ± 0.66
Latitude 42.70 ± 0.02
Longitude 11.84 ± 0.03
Depth (km) 5 ± 5 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 3329

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) 2742
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 123
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
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) 0.00518
Epicentral distance of station farthest from the epicenter (degree) 0.01587
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

Md:2.6

Field Value
Value 2.6
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 3329
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:08:07
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.AQU.Z. 1985-03-18T00:20:36.00 10.0 undecidable manual SN 105 0.0108 0.26 0.6
--.AR1.Z. 1985-03-18T00:20:34.00 10.0 undecidable manual SN 44 0.0102 -0.14 0.7
--.CH1.Z. 1985-03-18T00:20:28.50 10.0 undecidable manual SG 4 0.0083 0.44 0.4
--.SD1.Z. 1985-03-18T00:20:27.00 10.0 undecidable manual PN 123 0.0159 0.66 0.8
--.MNS.Z. 1985-03-18T00:20:20.00 10.0 undecidable manual SG 116 0.0062 -0.48 0.6
--.AQU.Z. 1985-03-18T00:20:18.50 10.0 undecidable manual PN 105 0.0108 -0.13 1.7
--.AR1.Z. 1985-03-18T00:20:16.00 10.0 undecidable manual PN 44 0.0102 -1.71 0.1
--.CH1.Z. 1985-03-18T00:20:14.50 10.0 undecidable manual PG 4 0.0083 0.3 1.4
--.MNS.Z. 1985-03-18T00:20:10.00 10.0 undecidable manual PG 116 0.0062 0.18 1.8
--.MA1.Z. 1985-03-18T00:20:07.50 10.0 undecidable manual PG 240 0.0052 -0.15 1.8
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
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