ISTITUTO NAZIONALE DI GEOFISICA E VULCANOLOGIA

Earthquake with magnitude of Md 2.2 on date 15-02-1985 and time 21:27:04 (Italy) in region 4 km NE Trevi (PG)

A magnitude Md 2.2 earthquake occured in region: 4 km NE Trevi (PG), on

  • 15-02-1985 20:27:04 (UTC)
  • 15-02-1985 21:27:04 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.9, 12.79 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
Trevi PG 4 8469 8469
Campello sul Clitunno PG 9 2442 10911
Foligno PG 9 57155 68066
Montefalco PG 11 5679 73745
Sellano PG 12 1079 74824
Castel Ritaldi PG 13 3278 78102
Spello PG 14 8645 86747
Cerreto di Spoleto PG 14 1075 87822
Bevagna PG 15 5081 92903
Vallo di Nera PG 16 364 93267
Valtopina PG 18 1398 94665
Giano dell'Umbria PG 19 3846 98511
Gualdo Cattaneo PG 19 6155 104666
Spoleto PG 19 38218 142884
Sant'Anatolia di Narco PG 19 564 143448
Cannara PG 20 4305 147753

Municipalities with at least 50000 inhabitants

An earthquake occurred to
9 Km SE of Foligno (57155 inhabitants)
39 Km N of Terni (111501 inhabitants)
40 Km SE of Perugia (166134 inhabitants)
77 Km NE of Viterbo (67173 inhabitants)
79 Km NW of L'Aquila (69753 inhabitants)
80 Km W of Teramo (54892 inhabitants)
97 Km SE of Arezzo (99543 inhabitants)
99 Km SW of Ancona (100861 inhabitants)
100 Km N of Guidonia Montecelio (88673 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 1985-02-15
20:27:04
42.9 12.79 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 1789
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-02-15 20:27:04 ± 0.097
Latitude 42.90 ± 0.00
Longitude 12.79 ± 0.01
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 1789

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) 979.1
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 140
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) 0.00162
Epicentral distance of station farthest from the epicenter (degree) 0.00461
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 3
Type of magnitude Md
Reference to an origin 1789
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:06:50
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.MNS.Z. 1985-02-15T20:27:23.50 10.0 undecidable manual SG 188 0.0046 0.1 0.5
--.CM8.Z. 1985-02-15T20:27:19.50 10.0 undecidable manual SG 41 0.0035 0.2 0.8
--.PO9.Z. 1985-02-15T20:27:18.00 10.0 undecidable manual SG 160 0.0031 0.23 0.4
--.MNS.Z. 1985-02-15T20:27:15.00 10.0 undecidable manual PG 188 0.0046 -0.52 0.3
--.CM8.Z. 1985-02-15T20:27:13.00 10.0 positive manual PG 41 0.0035 -0.15 2.9
--.PO9.Z. 1985-02-15T20:27:12.50 10.0 undecidable manual PG 160 0.0031 0.23 1
--.AS1.Z. 1985-02-15T20:27:12.80 10.0 undecidable manual SG 328 0.0016 0.07 0.7
--.AS1.Z. 1985-02-15T20:27:09.50 10.0 undecidable manual PG 328 0.0016 0.15 1.4
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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