ISTITUTO NAZIONALE DI GEOFISICA E VULCANOLOGIA

Earthquake with magnitude of Md 2.2 on date 04-02-1985 and time 02:04:01 (Italy) in region 3 km E Cerreto di Spoleto (PG)

A magnitude Md 2.2 earthquake occured in region: 3 km E Cerreto di Spoleto (PG), on

  • 04-02-1985 01:04:01 (UTC)
  • 04-02-1985 02:04:01 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.82, 12.95 at 12 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
Cerreto di Spoleto PG 3 1075 1075
Sellano PG 8 1079 2154
Vallo di Nera PG 9 364 2518
Preci PG 10 724 3242
Norcia PG 12 4957 8199
Poggiodomo PG 12 117 8316
Cascia PG 13 3217 11533
Sant'Anatolia di Narco PG 13 564 12097
Campello sul Clitunno PG 14 2442 14539
Scheggino PG 15 461 15000
Visso MC 17 1107 16107
Trevi PG 17 8469 24576
Castelsantangelo sul Nera MC 19 281 24857
Monteleone di Spoleto PG 19 599 25456
Spoleto PG 20 38218 63674
Monte Cavallo MC 20 145 63819

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km SE of Foligno (57155 inhabitants)
38 Km NE of Terni (111501 inhabitants)
55 Km SE of Perugia (166134 inhabitants)
64 Km NW of L'Aquila (69753 inhabitants)
64 Km W of Teramo (54892 inhabitants)
82 Km NE of Viterbo (67173 inhabitants)
93 Km N of Guidonia Montecelio (88673 inhabitants)
96 Km N of Tivoli (56533 inhabitants)
100 Km SW of Ancona (100861 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 2.2 1985-02-04
01:04:01
42.82 12.95 12 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 1049
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-02-04 01:04:01 ± 0.216
Latitude 42.82 ± 0.00
Longitude 12.95 ± 0.01
Depth (km) 12 ± 11 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 1049

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) 1159.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 159
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) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00219
Epicentral distance of station farthest from the epicenter (degree) 0.00429
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitude information

Md:2.2

Field Value
Value 2.2
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 1049
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:06:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.MNS.Z. 1985-02-04T01:04:18.50 10.0 undecidable manual SG 204 0.0043 -0.32 0.3
--.CM8.Z. 1985-02-04T01:04:16.30 10.0 undecidable manual SG 21 0.0036 0.08 0.7
--.AS1.Z. 1985-02-04T01:04:14.00 10.0 undecidable manual SG 318 0.0028 0.21 0.5
--.MNS.Z. 1985-02-04T01:04:11.50 10.0 undecidable manual PG 204 0.0043 0 1.6
--.PO9.Z. 1985-02-04T01:04:11.00 10.0 undecidable manual SG 180 0.0022 -0.41 0.2
--.CM8.Z. 1985-02-04T01:04:09.80 10.0 undecidable manual PG 21 0.0036 -0.19 1.2
--.AS1.Z. 1985-02-04T01:04:08.50 10.0 undecidable manual PG 318 0.0028 -0.1 1.7
--.PO9.Z. 1985-02-04T01:04:07.50 10.0 positive manual PG 180 0.0022 0.28 1.8
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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