Earthquake with magnitude of Md 2.1 on date 25-04-1985 and time 07:53:11 (Italy) in region 1 km W Vallo di Nera (PG)

A magnitude Md 2.1 earthquake occured in region: 1 km W Vallo di Nera (PG), on

  • 25-04-1985 05:53:11 (UTC)
  • 25-04-1985 07:53:11 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.77, 12.86 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 1 364 364
Sant'Anatolia di Narco PG 4 564 928
Scheggino PG 7 461 1389
Cerreto di Spoleto PG 8 1075 2464
Campello sul Clitunno PG 9 2442 4906
Poggiodomo PG 9 117 5023
Spoleto PG 10 38218 43241
Cascia PG 14 3217 46458
Sellano PG 15 1079 47537
Trevi PG 15 8469 56006
Monteleone di Spoleto PG 15 599 56605
Castel Ritaldi PG 16 3278 59883
Ferentillo TR 17 1913 61796
Preci PG 19 724 62520
Norcia PG 20 4957 67477

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km SE of Foligno (57155 inhabitants)
29 Km NE of Terni (111501 inhabitants)
54 Km SE of Perugia (166134 inhabitants)
64 Km NW of L'Aquila (69753 inhabitants)
70 Km W of Teramo (54892 inhabitants)
73 Km NE of Viterbo (67173 inhabitants)
86 Km N of Guidonia Montecelio (88673 inhabitants)
90 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 2.1 1985-04-25
05:53:11
42.77 12.86 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 5459
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-04-25 05:53:11 ± 0.185
Latitude 42.77 ± 0.01
Longitude 12.86 ± 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 5459

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) 2434.6
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) 0.1
Epicentral distance of station closest to the epicenter (degree) 0.00178
Epicentral distance of station farthest from the epicenter (degree) 0.00421
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 5459
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:09:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CM2.Z. 1985-04-25T05:53:28.90 10.0 undecidable manual SG 26 0.0042 0.24 0.3
--.MNS.Z. 1985-04-25T05:53:27.00 10.0 undecidable manual SG 198 0.0036 0.48 0
--.CM2.Z. 1985-04-25T05:53:21.30 10.0 undecidable manual PG 26 0.0042 -0.14 1
--.MNS.Z. 1985-04-25T05:53:20.00 10.0 undecidable manual PG 198 0.0036 -0.21 0.8
--.PO9.Z. 1985-04-25T05:53:20.00 10.0 undecidable manual SG 162 0.0018 -0.06 0.9
--.PO9.Z. 1985-04-25T05:53:16.50 10.0 positive manual PG 162 0.0018 0.02 3
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
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