Earthquake with magnitude of Md 2.6 on date 28-02-1990 and time 16:18:32 (Italy) in region 7 km NW Palazzuolo sul Senio (FI)

A magnitude Md 2.6 earthquake occured in region: 7 km NW Palazzuolo sul Senio (FI), on

  • 28-02-1990 15:18:32 (UTC)
  • 28-02-1990 16:18:32 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.15, 11.47 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

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Palazzuolo sul Senio FI 7 1154 1154
Firenzuola FI 8 4726 5880
Castel del Rio BO 8 1246 7126
Marradi FI 14 3139 10265
Fontanelice BO 14 1943 12208
Monghidoro BO 15 3749 15957
Casola Valsenio RA 15 2617 18574
Borgo Tossignano BO 18 3288 21862
Loiano BO 18 4294 26156

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km SW of Imola (69797 inhabitants)
36 Km W of Faenza (58541 inhabitants)
40 Km S of Bologna (386663 inhabitants)
42 Km NE of Prato (191150 inhabitants)
45 Km NE of Firenze (382808 inhabitants)
46 Km W of Forlì (117913 inhabitants)
49 Km NE of Scandicci (50609 inhabitants)
50 Km E of Pistoia (90315 inhabitants)
62 Km W of Cesena (96758 inhabitants)
66 Km W of Ravenna (159116 inhabitants)
70 Km SE of Modena (184973 inhabitants)
78 Km S of Ferrara (133155 inhabitants)
83 Km NW of Arezzo (99543 inhabitants)
84 Km E of Lucca (89046 inhabitants)
85 Km SE of Carpi (70699 inhabitants)
88 Km W of Rimini (147750 inhabitants)
91 Km SE of Reggio nell'Emilia (171345 inhabitants)
93 Km N of Siena (53903 inhabitants)
98 Km E of Pisa (89158 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
Rev 1000 Md 2.6 1990-02-28
15:18:32
44.15 11.47 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 110899
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1990-02-28 15:18:32 ± 0.393
Latitude 44.15 ± 0.03
Longitude 11.47 ± 0.02
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 110899

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) 3541.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 218
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
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) 0.00291
Epicentral distance of station farthest from the epicenter (degree) 0.01238
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

Md:2.6

Field Value
Value 2.6
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 110899
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 18:43:07
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ASS.Z. 1990-02-28T15:18:58.60 10.0 undecidable manual PN 141 0.0124 0.89 0.2
--.ARV.Z. 1990-02-28T15:18:55.60 10.0 undecidable manual PN 121 0.0112 -0.24 0.9
--.BDI.Z. 1990-02-28T15:18:55.00 10.0 undecidable manual SG 262 0.0057 0.09 0.6
--.CRE.Z. 1990-02-28T15:18:55.80 10.0 undecidable manual SG 146 0.0057 0.94 0.1
--.SFI.Z. 1990-02-28T15:18:47.00 10.0 undecidable manual SG 131 0.0032 0.7 0.2
--.FIR.E. 1990-02-28T15:18:47.00 10.0 undecidable manual SG 202 0.0036 -0.58 0.3
--.BDI.Z. 1990-02-28T15:18:45.40 10.0 positive manual PG 262 0.0057 -0.13 2.8
--.CRE.Z. 1990-02-28T15:18:45.60 10.0 undecidable manual PG 146 0.0057 0.11 1.4
--.PGD.Z. 1990-02-28T15:18:44.00 10.0 undecidable manual SG 146 0.0029 -1.09 0.1
--.FIR.Z. 1990-02-28T15:18:41.50 10.0 positive manual PG 202 0.0036 0.21 2.7
--.PGD.Z. 1990-02-28T15:18:40.20 10.0 undecidable manual PG 146 0.0029 0.35 1.2
--.SFI.Z. 1990-02-28T15:18:40.00 10.0 negative manual PG 131 0.0032 -0.55 1.6
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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