Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.5 on date 08-05-1990 and time 23:46:21 (UTC) in region 1 km E Sansepolcro (AR)

A magnitude Md 2.5 earthquake occured in region: 1 km E Sansepolcro (AR), on

  • 08-05-1990 23:46:21 (UTC)
  • 09-05-1990 01:46:21 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.5670, 12.1600 at 8 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Sansepolcro AR 2 15884 15884
San Giustino PG 2 11297 27181
Citerna PG 8 3531 30712
Anghiari AR 9 5638 36350
Monterchi AR 10 1757 38107
Città di Castello PG 14 39913 78020
Monte Santa Maria Tiberina PG 14 1183 79203
Pieve Santo Stefano AR 15 3183 82386
Borgo Pace PU 15 606 82992
Badia Tedalda AR 16 1087 84079
Caprese Michelangelo AR 16 1426 85505
Mercatello sul Metauro PU 17 1378 86883
Sestino AR 19 1355 88238

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km E of Arezzo (99543 inhabitants)
54 Km NW of Perugia (166134 inhabitants)
64 Km S of Cesena (96758 inhabitants)
64 Km SW of Rimini (147750 inhabitants)
72 Km SW of Pesaro (94582 inhabitants)
72 Km E of Siena (53903 inhabitants)
74 Km S of Forlì (117913 inhabitants)
76 Km W of Fano (60888 inhabitants)
76 Km E of Firenze (382808 inhabitants)
81 Km NW of Foligno (57155 inhabitants)
82 Km E of Scandicci (50609 inhabitants)
83 Km S of Faenza (58541 inhabitants)
92 Km E of Prato (191150 inhabitants)
95 Km SE of Imola (69797 inhabitants)
95 Km S of Ravenna (159116 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 2.5
ML-VAX 1.7 		1990-05-08
23:46:21		 43.567 12.16 8 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 117779
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1990-05-08 23:46:21 ± 0.235
Latitude 43.5670 ± 0.0166
Longitude 12.1600 ± 0.0197
Depth (km) 8 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 117779

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) 2435.3
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 144
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
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) 0.00138
Epicentral distance of station farthest from the epicenter (degree) 0.01101
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 117779
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 18:49:23

ML:1.7

Field Value
Value 1.7
Uncertainty
Num. used stations 2
Type of magnitude ML
Reference to an origin 117779
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(km) Takeoff_angle Residual Weight
--.BDI.Z. 1990-05-08T23:47:01.50 10.0 undecidable manual SN 294 1.221 -0.63 0.2
--.BDI.Z. 1990-05-08T23:46:45.50 10.0 undecidable manual PN 294 1.221 0.35 1
--.ASS.Z. 1990-05-08T23:46:45.00 10.0 undecidable manual SG 144 0.6105 0.97 0.1
--.ARV.Z. 1990-05-08T23:46:43.34 10.0 undecidable manual SG 96 0.5661 0.8 0.2
--.PGD.Z. 1990-05-08T23:46:38.26 10.0 undecidable manual SG 314 0.444 -0.09 0.8
--.SFI.Z. 1990-05-08T23:46:37.79 10.0 undecidable manual SG 326 0.3996 0.62 0.4
--.ASS.Z. 1990-05-08T23:46:34.50 10.0 undecidable manual PG 144 0.6105 -0.2 1.8
--.ARV.Z. 1990-05-08T23:46:32.93 10.0 undecidable manual PG 96 0.5661 -0.91 0.4
--.PGD.Z. 1990-05-08T23:46:31.16 10.0 undecidable manual PG 314 0.444 -0.26 1.8
--.RSM.Z. 1990-05-08T23:46:31.37 10.0 undecidable manual PG 29 0.4107 0.38 1.5
--.SFI.Z. 1990-05-08T23:46:30.50 10.0 undecidable manual PG 326 0.3996 -0.23 1.9
--.CRE.Z. 1990-05-08T23:46:29.00 10.0 undecidable manual SG 289 0.1554 0.24 0.7
--.CRE.Z. 1990-05-08T23:46:26.00 10.0 undecidable manual PG 289 0.1554 0.13 2
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