Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.1 on date 09-05-1990 and time 00:05:25 (UTC) in region 4 km NW Sansepolcro (AR)

A magnitude Md 2.1 earthquake occured in region: 4 km NW Sansepolcro (AR), on

  • 09-05-1990 00:05:25 (UTC)
  • 09-05-1990 02:05:25 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.6000, 12.1150 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.

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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 4 15884 15884
San Giustino PG 8 11297 27181
Anghiari AR 8 5638 32819
Pieve Santo Stefano AR 10 3183 36002
Citerna PG 11 3531 39533
Caprese Michelangelo AR 12 1426 40959
Monterchi AR 13 1757 42716
Badia Tedalda AR 13 1087 43803
Borgo Pace PU 16 606 44409
Chiusi della Verna AR 18 2023 46432
Monte Santa Maria Tiberina PG 19 1183 47615
Mercatello sul Metauro PU 19 1378 48993
Città di Castello PG 19 39913 88906
Sestino AR 19 1355 90261
Subbiano AR 20 6331 96592

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km NE of Arezzo (99543 inhabitants)
59 Km NW of Perugia (166134 inhabitants)
61 Km S of Cesena (96758 inhabitants)
63 Km SW of Rimini (147750 inhabitants)
70 Km S of Forlì (117913 inhabitants)
70 Km E of Siena (53903 inhabitants)
72 Km E of Firenze (382808 inhabitants)
73 Km W of Pesaro (94582 inhabitants)
77 Km E of Scandicci (50609 inhabitants)
78 Km W of Fano (60888 inhabitants)
79 Km S of Faenza (58541 inhabitants)
86 Km NW of Foligno (57155 inhabitants)
88 Km E of Prato (191150 inhabitants)
90 Km SE of Imola (69797 inhabitants)
91 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 2.1
ML-VAX 1.5 		1990-05-09
00:05:25		 43.6 12.115 10 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 117819
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1990-05-09 00:05:25 ± 0.12
Latitude 43.6000 ± 0.0079
Longitude 12.1150 ± 0.0092
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 117819

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) 1151.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 135
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
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) 0.00105
Epicentral distance of station farthest from the epicenter (degree) 0.01069
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:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 5
Type of magnitude Md
Reference to an origin 117819
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 18:49:25

ML:1.5

Field Value
Value 1.5
Uncertainty
Num. used stations 3
Type of magnitude ML
Reference to an origin 117819
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. 1990-05-09T00:06:04.00 10.0 undecidable manual SN 293 1.1877 -0.09 0.5
--.ASS.Z. 1990-05-09T00:05:48.93 10.0 undecidable manual SG 143 0.6549 0.35 0.4
--.BDI.Z. 1990-05-09T00:05:48.00 10.0 undecidable manual PN 293 1.1877 0.28 0.9
--.ARV.Z. 1990-05-09T00:05:46.34 10.0 undecidable manual SG 99 0.5994 -0.48 0.2
--.PGD.Z. 1990-05-09T00:05:40.65 10.0 undecidable manual SG 314 0.3996 0.67 0.1
--.RSM.Z. 1990-05-09T00:05:40.70 10.0 undecidable manual SG 36 0.3996 0.3 0.5
--.SFI.Z. 1990-05-09T00:05:38.97 10.0 undecidable manual SG 327 0.3552 0.13 0.8
--.ASS.Z. 1990-05-09T00:05:38.53 10.0 undecidable manual PG 143 0.6549 -0.23 1.4
--.ARV.Z. 1990-05-09T00:05:37.96 10.0 undecidable manual PG 99 0.5994 0.22 1.5
--.RSM.Z. 1990-05-09T00:05:34.19 10.0 undecidable manual PG 36 0.3996 0.16 1.9
--.PGD.Z. 1990-05-09T00:05:33.58 10.0 undecidable manual PG 314 0.3996 -0.21 1.7
--.SFI.Z. 1990-05-09T00:05:32.75 10.0 negative manual PG 327 0.3552 -0.38 1.9
--.CRE.Z. 1990-05-09T00:05:30.96 10.0 undecidable manual SG 279 0.1221 -0.15 0.7
--.CRE.Z. 1990-05-09T00:05:28.93 10.0 undecidable manual PG 279 0.1221 0.26 1.5
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