Earthquake with magnitude of Md 2.6 on date 30-04-1993 and time 20:31:17 (Italy) in region 1 km N Norcia (PG)

A magnitude Md 2.6 earthquake occured in region: 1 km N Norcia (PG), on

  • 30-04-1993 18:31:17 (UTC)
  • 30-04-1993 20:31:17 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.802, 13.092 at 25 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 1 4957 4957
Preci PG 10 724 5681
Cascia PG 11 3217 8898
Castelsantangelo sul Nera MC 12 281 9179
Visso MC 14 1107 10286
Cerreto di Spoleto PG 14 1075 11361
Poggiodomo PG 16 117 11478
Ussita MC 16 444 11922
Sellano PG 17 1079 13001
Arquata del Tronto AP 17 1178 14179
Accumoli RI 17 667 14846
Vallo di Nera PG 19 364 15210

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km E of Foligno (57155 inhabitants)
45 Km NE of Terni (111501 inhabitants)
53 Km W of Teramo (54892 inhabitants)
56 Km NW of L'Aquila (69753 inhabitants)
67 Km SE of Perugia (166134 inhabitants)
91 Km E of Viterbo (67173 inhabitants)
92 Km W of Montesilvano (53738 inhabitants)
94 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km N of Tivoli (56533 inhabitants)
97 Km SW of Ancona (100861 inhabitants)
99 Km W of Pescara (121014 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
ML-VAX 1.8
1993-04-30
18:31:17
42.802 13.092 25 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 184199
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1993-04-30 18:31:17 ± 0.274
Latitude 42.8020 ± 0.0123
Longitude 13.0920 ± 0.0405
Depth (km) 25 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 184199

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) 3578.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 161
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) 0.00364
Epicentral distance of station farthest from the epicenter (degree) 0.00631
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitudes information

Md:2.6

Field Value
Value 2.6
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 184199
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:52:55

ML:1.8

Field Value
Value 1.8
Uncertainty
Num. used stations 4
Type of magnitude ML
Reference to an origin 184199
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ARV.Z. 1993-04-30T18:31:42.50 10.0 undecidable manual SN 350 0.0063 0.38 0.2
--.MNS.Z. 1993-04-30T18:31:36.44 10.0 undecidable manual SG 215 0.0046 -0.14 0.5
--.AQU.Z. 1993-04-30T18:31:35.35 10.0 undecidable manual SG 152 0.0045 -0.84 0
--.ASS.Z. 1993-04-30T18:31:33.29 10.0 undecidable manual SG 308 0.0036 -0.24 0.4
--.ARV.Z. 1993-04-30T18:31:31.23 10.0 negative manual PN 350 0.0063 -0.17 2.1
--.AQU.Z. 1993-04-30T18:31:28.72 10.0 undecidable manual PG 152 0.0045 0.48 0.4
--.MNS.Z. 1993-04-30T18:31:28.49 10.0 negative manual PG 215 0.0046 0.03 2.9
--.ASS.Z. 1993-04-30T18:31:26.82 10.0 undecidable manual PG 308 0.0036 0.12 1.4
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
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