Earthquake with magnitude of Md 2.1 on date 27-02-1985 and time 03:36:22 (UTC) in region 2 km SE Gualdo Cattaneo (PG)

A magnitude Md 2.1 earthquake occured in region: 2 km SE Gualdo Cattaneo (PG), on

  • 27-02-1985 03:36:22 (UTC)
  • 27-02-1985 04:36:22 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.9, 12.58 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
Gualdo Cattaneo PG 2 6155 6155
Bevagna PG 5 5081 11236
Montefalco PG 6 5679 16915
Giano dell'Umbria PG 7 3846 20761
Collazzone PG 11 3473 24234
Castel Ritaldi PG 11 3278 27512
Cannara PG 11 4305 31817
Foligno PG 13 57155 88972
Spello PG 14 8645 97617
Massa Martana PG 14 3770 101387
Trevi PG 14 8469 109856
Bettona PG 15 4367 114223
Deruta PG 16 9669 123892
Fratta Todina PG 17 1839 125731
Todi PG 18 16851 142582
Campello sul Clitunno PG 19 2442 145024
Torgiano PG 19 6725 151749
Monte Castello di Vibio PG 19 1567 153316
Marsciano PG 19 18902 172218
Bastia Umbra PG 19 21874 194092
Assisi PG 20 28299 222391

Municipalities with at least 50000 inhabitants

An earthquake occurred to
13 Km SW of Foligno (57155 inhabitants)
28 Km SE of Perugia (166134 inhabitants)
38 Km N of Terni (111501 inhabitants)
65 Km NE of Viterbo (67173 inhabitants)
85 Km SE of Arezzo (99543 inhabitants)
91 Km NW of L'Aquila (69753 inhabitants)
96 Km W of Teramo (54892 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 2.1 1985-02-27
03:36:22
42.9 12.58 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 2629
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-02-27 03:36:22 ± 0.362
Latitude 42.90 ± 0.01
Longitude 12.58 ± 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 2629

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) 3449.1
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 238
Number of associated phases, regardless of their use for origin computation 5
Number of defining phases 5
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) 0.00154
Epicentral distance of station farthest from the epicenter (degree) 0.00453
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 2
Type of magnitude Md
Reference to an origin 2629
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:07:31
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CM8.Z. 1985-02-27T03:36:41.30 10.0 undecidable manual SG 54 0.0045 0.36 0.3
--.CM8.Z. 1985-02-27T03:36:32.60 10.0 undecidable manual PG 54 0.0045 -0.58 0.5
--.PO9.Z. 1985-02-27T03:36:31.50 10.0 undecidable manual PG 139 0.0037 0.04 1.7
--.AS1.Z. 1985-02-27T03:36:30.20 10.0 undecidable manual SG 18 0.0015 0.04 0.7
--.AS1.Z. 1985-02-27T03:36:27.00 10.0 undecidable manual PG 18 0.0015 0.04 1.8
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download