Earthquake with magnitude of Md 2.1 on date 26-05-1985 and time 23:50:51 (UTC) in region 5 km SE Preci (PG)

A magnitude Md 2.1 earthquake occured in region: 5 km SE Preci (PG), on

  • 26-05-1985 23:50:51 (UTC)
  • 27-05-1985 01:50:51 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.83, 13.06 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
Norcia PG 5 4957 4957
Preci PG 5 724 5681
Castelsantangelo sul Nera MC 10 281 5962
Visso MC 11 1107 7069
Cerreto di Spoleto PG 12 1075 8144
Sellano PG 12 1079 9223
Cascia PG 13 3217 12440
Ussita MC 14 444 12884
Poggiodomo PG 17 117 13001
Vallo di Nera PG 18 364 13365
Monte Cavallo MC 18 145 13510

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km E of Foligno (57155 inhabitants)
45 Km NE of Terni (111501 inhabitants)
56 Km W of Teramo (54892 inhabitants)
60 Km NW of L'Aquila (69753 inhabitants)
62 Km E of Perugia (166134 inhabitants)
91 Km NE of Viterbo (67173 inhabitants)
95 Km SW of Ancona (100861 inhabitants)
96 Km W of Montesilvano (53738 inhabitants)
97 Km N of Guidonia Montecelio (88673 inhabitants)
99 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 1985-05-26
23:50:51
42.83 13.06 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 7339
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-05-26 23:50:51 ± 0.223
Latitude 42.83 ± 0.01
Longitude 13.06 ± 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 7339

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) 2139.9
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 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00243
Epicentral distance of station farthest from the epicenter (degree) 0.00469
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:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 7339
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:11:34
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.MNS.Z. 1985-05-26T23:51:09.90 10.0 undecidable manual SG 211 0.0047 -0.3 0.5
--.CM2.Z. 1985-05-26T23:51:05.00 10.0 undecidable manual SG 9 0.0032 0.11 0.9
--.ALP.Z. 1985-05-26T23:51:05.10 10.0 undecidable manual SG 97 0.0033 -0.21 0.8
--.PO9.Z. 1985-05-26T23:51:02.80 10.0 undecidable manual SG 198 0.0024 0.77 0.3
--.MNS.Z. 1985-05-26T23:51:01.00 10.0 undecidable manual PG 211 0.0047 -1.22 0.1
--.CM2.Z. 1985-05-26T23:50:59.20 10.0 undecidable manual PG 9 0.0032 0.05 3
--.ALP.Z. 1985-05-26T23:50:59.40 10.0 undecidable manual PG 97 0.0033 0 1.5
--.PO9.Z. 1985-05-26T23:50:58.00 10.0 undecidable manual PG 198 0.0024 0.5 0.9
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