Earthquake with magnitude of Md 2.6 on date 20-05-1986 and time 03:59:04 (Italy) in region 3 km W Norcia (PG)

A magnitude Md 2.6 earthquake occured in region: 3 km W Norcia (PG), on

  • 20-05-1986 01:59:04 (UTC)
  • 20-05-1986 03:59:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.798, 13.052 at 3 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 3 4957 4957
Preci PG 9 724 5681
Cascia PG 9 3217 8898
Cerreto di Spoleto PG 11 1075 9973
Poggiodomo PG 13 117 10090
Castelsantangelo sul Nera MC 14 281 10371
Sellano PG 14 1079 11450
Visso MC 15 1107 12557
Vallo di Nera PG 16 364 12921
Ussita MC 18 444 13365
Monteleone di Spoleto PG 18 599 13964
Sant'Anatolia di Narco PG 19 564 14528
Accumoli RI 20 667 15195

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km SE of Foligno (57155 inhabitants)
42 Km NE of Terni (111501 inhabitants)
56 Km W of Teramo (54892 inhabitants)
57 Km NW of L'Aquila (69753 inhabitants)
64 Km SE of Perugia (166134 inhabitants)
88 Km E of Viterbo (67173 inhabitants)
93 Km N of Guidonia Montecelio (88673 inhabitants)
95 Km N of Tivoli (56533 inhabitants)
95 Km W of Montesilvano (53738 inhabitants)
99 Km SW of Ancona (100861 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
Bulletin
Rev1000
Md 2.6 1986-05-20
01:59:04
42.798 13.052 3 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 27679
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1986-05-20 01:59:04 ± 0.36
Latitude 42.7980 ± 0.0056
Longitude 13.0520 ± 0.0137
Depth (km) 3 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 27679

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) 1283.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 156
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
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) 0.00445
Epicentral distance of station farthest from the epicenter (degree) 0.01101
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

Md:2.6

Field Value
Value 2.6
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 27679
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:29:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.SD1.Z. 1986-05-20T01:59:46.00 10.0 undecidable manual SN 152 0.011 0.16 0.5
--.CRE.Z. 1986-05-20T01:59:43.50 10.0 undecidable manual SN 315 0.0103 -0.54 0.2
--.ARV.Z. 1986-05-20T01:59:30.50 10.0 undecidable manual SG 353 0.0063 0.23 1
--.CRE.Z. 1986-05-20T01:59:28.00 10.0 undecidable manual PN 315 0.0103 0.69 0.3
--.SD1.Z. 1986-05-20T01:59:28.00 10.0 undecidable manual PN 152 0.011 -0.35 1
--.AQU.Z. 1986-05-20T01:59:24.00 10.0 undecidable manual SG 149 0.0046 -0.1 0.8
--.MNS.Z. 1986-05-20T01:59:23.50 10.0 undecidable manual SG 213 0.0045 -0.03 1.2
--.ARV.Z. 1986-05-20T01:59:19.00 10.0 undecidable manual PG 353 0.0063 -0.36 1
--.AQU.Z. 1986-05-20T01:59:16.00 10.0 undecidable manual PG 149 0.0046 0.2 1.7
--.MNS.Z. 1986-05-20T01:59:15.50 10.0 undecidable manual PG 213 0.0045 0.03 2.1
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download