Earthquake with magnitude of Md 3.0 on date 20-04-1991 and time 15:47:51 (Italy) in region Costa Marchigiana Anconetana (Ancona)

A magnitude Md 3.0 earthquake occured in region: Costa Marchigiana Anconetana (Ancona), on

  • 20-04-1991 13:47:51 (UTC)
  • 20-04-1991 15:47:51 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.803, 13.711 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

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km NE of Ancona (100861 inhabitants)
56 Km E of Fano (60888 inhabitants)
65 Km E of Pesaro (94582 inhabitants)
96 Km E of Rimini (147750 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 3.0
M 3.1
1991-04-20
13:47:51
43.803 13.711 11 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 139529
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-04-20 13:47:51 ± 0.675
Latitude 43.8030 ± 0.0190
Longitude 13.7110 ± 0.0368
Depth (km) 11 ± 5 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 139529

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) 3635.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 141
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 29
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.8
Epicentral distance of station closest to the epicenter (degree) 0.00235
Epicentral distance of station farthest from the epicenter (degree) 0.02955
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 19
Magnitudes information

Md:3

Field Value
Value 3
Uncertainty
Num. used stations 8
Type of magnitude Md
Reference to an origin 139529
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:10:15

M:3.1

Field Value
Value 3.1
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 139529
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 09:44:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.PTJ.Z. 1991-04-20T13:49:08.20 10.0 undecidable manual SN! 36 0.0238 3.28 0
--.CTI.Z. 1991-04-20T13:49:03.66 10.0 undecidable manual SN 327 0.024 -1.97 0.1
--.LJU.Z. 1991-04-20T13:48:58.00 10.0 undecidable manual SN 14 0.0208 0.99 0.4
--.SDI.Z. 1991-04-20T13:48:50.00 10.0 undecidable manual SN 177 0.0188 -1.82 0.2
--.CEY.Z. 1991-04-20T13:48:50.00 10.0 undecidable manual SN 14 0.018 0.42 0.7
--.TRI.Z. 1991-04-20T13:48:46.43 10.0 undecidable manual SN 1 0.0171 -0.89 0.5
--.KBA.Z. 1991-04-20T13:48:42.00 10.0 positive manual PN 355 0.0295 -0.71 2.2
--.RIY.Z. 1991-04-20T13:48:40.70 10.0 undecidable manual SN 17 0.0145 0.36 1
--.MNS.Z. 1991-04-20T13:48:40.79 10.0 undecidable manual SN 208 0.0144 0.61 0.6
--.PGD.Z. 1991-04-20T13:48:36.25 10.0 undecidable manual SN 273 0.0129 0.09 0.7
--.PTJ.Z. 1991-04-20T13:48:35.30 10.0 undecidable manual PN 36 0.0238 1.35 0.7
--.FVI.Z. 1991-04-20T13:48:35.69 10.0 undecidable manual PN 347 0.0257 -1.27 0.7
--.SFI.Z. 1991-04-20T13:48:34.80 10.0 undecidable manual SN 274 0.0121 0.76 0.6
--.CTI.Z. 1991-04-20T13:48:33.45 10.0 undecidable manual PN 327 0.024 -0.91 1
--.LJU.Z. 1991-04-20T13:48:30.00 10.0 undecidable manual PN 14 0.0208 0.62 1.4
--.VOY.Z. 1991-04-20T13:48:29.59 10.0 undecidable manual PN 3 0.0201 1.33 0.8
--.MME.Z. 1991-04-20T13:48:29.11 10.0 undecidable manual PN 281 0.0198 1.28 0.8
--.VBY.Z. 1991-04-20T13:48:26.80 10.0 undecidable manual PN 32 0.0182 1.37 0.7
--.SDI.Z. 1991-04-20T13:48:26.80 10.0 undecidable manual PN 177 0.0188 0.41 1.6
--.CEY.Z. 1991-04-20T13:48:25.41 10.0 undecidable manual PN 14 0.018 0.32 1.7
--.TRI.Z. 1991-04-20T13:48:22.90 10.0 undecidable manual PN 1 0.0171 -1.7 0.5
--.MNS.Z. 1991-04-20T13:48:19.47 10.0 undecidable manual PN 208 0.0144 -0.2 1.8
--.RIY.Z. 1991-04-20T13:48:18.80 10.0 undecidable manual PN 17 0.0145 -0.96 1.2
--.AQU.Z. 1991-04-20T13:48:18.00 10.0 undecidable manual PN 188 0.0131 0.24 1.8
--.PGD.Z. 1991-04-20T13:48:17.27 10.0 undecidable manual PN 273 0.0129 -0.08 1.8
--.SFI.Z. 1991-04-20T13:48:16.00 10.0 undecidable manual PN 274 0.0121 -0.12 1.8
--.CRE.Z. 1991-04-20T13:48:15.90 10.0 undecidable manual PN 262 0.0115 0.63 1.5
--.ARV.Z. 1991-04-20T13:48:06.00 10.0 undecidable manual PG 241 0.0057 1.53 0.6
--.AOI.Z. 1991-04-20T13:47:55.81 10.0 undecidable manual PG 197 0.0023 -1.88 0.4
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
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Type Description Link
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