Earthquake with magnitude of Md 2.1 on date 04-02-1985 and time 01:03:37 (UTC) in region 3 km NW Cerreto di Spoleto (PG)

A magnitude Md 2.1 earthquake occured in region: 3 km NW Cerreto di Spoleto (PG), on

  • 04-02-1985 01:03:37 (UTC)
  • 04-02-1985 02:03:37 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.84, 12.9 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
Cerreto di Spoleto PG 3 1075 1075
Sellano PG 6 1079 2154
Vallo di Nera PG 9 364 2518
Campello sul Clitunno PG 10 2442 4960
Preci PG 12 724 5684
Trevi PG 13 8469 14153
Sant'Anatolia di Narco PG 13 564 14717
Poggiodomo PG 15 117 14834
Scheggino PG 16 461 15295
Cascia PG 17 3217 18512
Norcia PG 17 4957 23469
Spoleto PG 18 38218 61687
Visso MC 18 1107 62794
Castel Ritaldi PG 19 3278 66072
Monte Cavallo MC 19 145 66217

Municipalities with at least 50000 inhabitants

An earthquake occurred to
20 Km SE of Foligno (57155 inhabitants)
38 Km NE of Terni (111501 inhabitants)
51 Km SE of Perugia (166134 inhabitants)
68 Km NW of L'Aquila (69753 inhabitants)
69 Km W of Teramo (54892 inhabitants)
81 Km NE of Viterbo (67173 inhabitants)
95 Km N of Guidonia Montecelio (88673 inhabitants)
98 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 2.1 1985-02-04
01:03:37
42.84 12.9 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 1039
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-02-04 01:03:37 ± 0.159
Latitude 42.84 ± 0.01
Longitude 12.90 ± 0.04
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 1039

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) 3129.1
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 187
Number of associated phases, regardless of their use for origin computation 6
Number of defining phases 6
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) 0.00243
Epicentral distance of station farthest from the epicenter (degree) 0.00437
Number of stations at which the event was observed 3
Number of stations from which data was used for origin computation 3
Magnitude information

Md:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 1039
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. 1985-02-04T01:03:55.50 10.0 undecidable manual SG 199 0.0044 0.01 0.6
--.CM8.Z. 1985-02-04T01:03:52.80 10.0 undecidable manual SG 26 0.0035 0.29 0.6
--.PO9.Z. 1985-02-04T01:03:49.00 10.0 undecidable manual SG 173 0.0024 0.42 0.3
--.MNS.Z. 1985-02-04T01:03:48.30 10.0 undecidable manual PG 199 0.0044 0.21 1.1
--.CM8.Z. 1985-02-04T01:03:46.20 10.0 undecidable manual PG 26 0.0035 -0.16 1.4
--.PO9.Z. 1985-02-04T01:03:43.80 10.0 positive manual PG 173 0.0024 -0.29 1.9
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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