Earthquake with magnitude of Md 2.2 on date 26-02-1985 and time 02:51:25 (Italy) in region 5 km N Vallo di Nera (PG)

A magnitude Md 2.2 earthquake occured in region: 5 km N Vallo di Nera (PG), on

  • 26-02-1985 01:51:25 (UTC)
  • 26-02-1985 02:51:25 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.81, 12.85 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
Vallo di Nera PG 5 364 364
Cerreto di Spoleto PG 6 1075 1439
Campello sul Clitunno PG 6 2442 3881
Sant'Anatolia di Narco PG 9 564 4445
Scheggino PG 11 461 4906
Sellano PG 11 1079 5985
Trevi PG 11 8469 14454
Spoleto PG 12 38218 52672
Poggiodomo PG 13 117 52789
Castel Ritaldi PG 14 3278 56067
Cascia PG 17 3217 59284
Preci PG 17 724 60008
Montefalco PG 19 5679 65687
Monteleone di Spoleto PG 20 599 66286
Foligno PG 20 57155 123441

Municipalities with at least 50000 inhabitants

An earthquake occurred to
20 Km SE of Foligno (57155 inhabitants)
32 Km NE of Terni (111501 inhabitants)
50 Km SE of Perugia (166134 inhabitants)
68 Km NW of L'Aquila (69753 inhabitants)
72 Km W of Teramo (54892 inhabitants)
75 Km NE of Viterbo (67173 inhabitants)
91 Km N of Guidonia Montecelio (88673 inhabitants)
94 Km N of Tivoli (56533 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 1985-02-26
01:51:25
42.81 12.85 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 2539
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-02-26 01:51:25 ± 0.133
Latitude 42.81 ± 0.01
Longitude 12.85 ± 0.02
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 2539

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) 1768.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 134
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) 0.00397
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 2539
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:07:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CM8.Z. 1985-02-26T01:51:41.70 10.0 undecidable manual SG 29 0.0039 0.07 1.1
--.MNS.Z. 1985-02-26T01:51:41.80 10.0 undecidable manual SG 196 0.004 0.03 0.7
--.AS1.Z. 1985-02-26T01:51:37.50 10.0 undecidable manual SG 330 0.0026 0.69 0.1
--.PO9.Z. 1985-02-26T01:51:36.00 10.0 undecidable manual SG 164 0.0022 0.57 0.2
--.MNS.Z. 1985-02-26T01:51:34.50 10.0 undecidable manual PG 196 0.004 -0.44 0.8
--.CM8.E. 1985-02-26T01:51:34.60 10.0 undecidable manual PG 29 0.0039 -0.26 1.4
--.AS1.Z. 1985-02-26T01:51:32.00 10.0 undecidable manual PG 330 0.0026 -0.08 2
--.PO9.Z. 1985-02-26T01:51:31.50 10.0 undecidable manual PG 164 0.0022 0.22 1.7
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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