Earthquake with magnitude of Md 2.6 on date 23-07-1985 and time 01:35:42 (Italy) in region 5 km SE Giano dell'Umbria (PG)

A magnitude Md 2.6 earthquake occured in region: 5 km SE Giano dell'Umbria (PG), on

  • 22-07-1985 23:35:42 (UTC)
  • 23-07-1985 01:35:42 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8, 12.61 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
Giano dell'Umbria PG 5 3846 3846
Castel Ritaldi PG 6 3278 7124
Massa Martana PG 8 3770 10894
Montefalco PG 11 5679 16573
Spoleto PG 13 38218 54791
Gualdo Cattaneo PG 13 6155 60946
Acquasparta TR 13 4778 65724
Campello sul Clitunno PG 14 2442 68166
Trevi PG 14 8469 76635
Bevagna PG 15 5081 81716
Todi PG 17 16851 98567
Collazzone PG 18 3473 102040
Foligno PG 19 57155 159195
Montecastrilli TR 19 5022 164217
Sant'Anatolia di Narco PG 20 564 164781

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km SW of Foligno (57155 inhabitants)
27 Km N of Terni (111501 inhabitants)
39 Km SE of Perugia (166134 inhabitants)
59 Km NE of Viterbo (67173 inhabitants)
82 Km NW of L'Aquila (69753 inhabitants)
89 Km N of Guidonia Montecelio (88673 inhabitants)
91 Km W of Teramo (54892 inhabitants)
94 Km N of Tivoli (56533 inhabitants)
95 Km SE 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 1985-07-22
23:35:42
42.8 12.61 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 10639
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-07-22 23:35:42 ± 0.239
Latitude 42.80 ± 0.01
Longitude 12.61 ± 0.03
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 10639

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) 2686.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 157
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
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) 0.00235
Epicentral distance of station farthest from the epicenter (degree) 0.00858
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 3
Type of magnitude Md
Reference to an origin 10639
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:14:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CH1.Z. 1985-07-22T23:36:16.00 10.0 undecidable manual SG 329 0.0086 0.79 0.2
--.AR1.Z. 1985-07-22T23:36:09.00 10.0 undecidable manual SG 19 0.0066 0.8 0.3
--.CM2.Z. 1985-07-22T23:36:03.20 10.0 undecidable manual SG 44 0.0049 0.99 0.3
--.CH1.Z. 1985-07-22T23:36:01.00 10.0 undecidable manual PG 329 0.0086 -0.42 1.2
--.MNS.Z. 1985-07-22T23:35:59.00 10.0 undecidable manual SG 172 0.0037 1.06 0.1
--.AR1.Z. 1985-07-22T23:35:57.00 10.0 undecidable manual PG 19 0.0066 -0.37 1.5
--.PO9.Z. 1985-07-22T23:35:55.00 10.0 undecidable manual SG 132 0.0029 -0.16 0.8
--.CM2.Z. 1985-07-22T23:35:53.20 10.0 undecidable manual PG 44 0.0049 -0.71 1
--.AS1.Z. 1985-07-22T23:35:52.50 10.0 undecidable manual SG 6 0.0023 -0.45 0.9
--.MNS.Z. 1985-07-22T23:35:51.50 10.0 undecidable manual PG 172 0.0037 0.05 2.2
--.PO9.Z. 1985-07-22T23:35:49.50 10.0 undecidable manual PG 132 0.0029 -0.34 1.8
--.AS1.Z. 1985-07-22T23:35:49.00 10.0 undecidable manual PG 6 0.0023 0.43 1.6
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