Earthquake with magnitude of ML 0.9 on date 25-05-2021 and time 02:53:28 (Italy) in region 5 km NE Palazzuolo sul Senio (FI)

A magnitude ML 0.9 earthquake occured in region: 5 km NE Palazzuolo sul Senio (FI), on

  • 25-05-2021 00:53:28 (UTC)
  • 25-05-2021 02:53:28 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.1360, 11.6010 at 9 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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 5 1154 1154
Marradi FI 7 3139 4293
Casola Valsenio RA 10 2617 6910
Castel del Rio BO 12 1246 8156
Tredozio FC 13 1212 9368
Fontanelice BO 14 1943 11311
Modigliana FC 16 4560 15871
Borgo Tossignano BO 16 3288 19159
Brisighella RA 17 7639 26798
Firenzuola FI 18 4726 31524
Casalfiumanese BO 18 3438 34962
Riolo Terme RA 19 5720 40682
Portico e San Benedetto FC 19 756 41438

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km SW of Imola (69797 inhabitants)
28 Km SW of Faenza (58541 inhabitants)
37 Km W of Forlì (117913 inhabitants)
45 Km SE of Bologna (386663 inhabitants)
49 Km NE of Firenze (382808 inhabitants)
49 Km NE of Prato (191150 inhabitants)
51 Km W of Cesena (96758 inhabitants)
54 Km NE of Scandicci (50609 inhabitants)
57 Km SW of Ravenna (159116 inhabitants)
59 Km E of Pistoia (90315 inhabitants)
78 Km W of Rimini (147750 inhabitants)
78 Km NW of Arezzo (99543 inhabitants)
78 Km S of Ferrara (133155 inhabitants)
78 Km SE of Modena (184973 inhabitants)
92 Km SE of Carpi (70699 inhabitants)
93 Km N of Siena (53903 inhabitants)
94 Km E of Lucca (89046 inhabitants)
99 Km SE of Reggio nell'Emilia (171345 inhabitants)
Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 0.9 2021-05-25
00:53:28
44.136 11.601 9 2021-05-25
01:06:50
Sala Sismica INGV-Roma 90468421
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-05-25 00:53:28 ± 0.08
Latitude 44.1360 ± 0.0063
Longitude 11.6010 ± 0.0063
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 90468421

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 584
Semi-minor axis of confidence ellipse (meter) 481
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 354
Circular confidence region, given by single value of horizontal uncertainty (meter) 580.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 87
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.36512
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 9
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 90468421
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-05-25 01:06:50
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ASQU.HHE. 2021-05-25T00:53:42.94 0.6 undecidable manual S 158 0.3651 50 0.53 43
IV.FAZ.HNZ. 2021-05-25T00:53:41.77 3.0 undecidable manual S 0
IV.RUFI.EHN. 2021-05-25T00:53:40.86 0.6 undecidable manual S 192 0.3049 50 0.23 47
IV.SFI.EHE. 2021-05-25T00:53:40.60 0.6 undecidable manual S 143 0.2914 50 0.39 45
IV.MTRZ.HNZ. 2021-05-25T00:53:38.48 0.6 undecidable manual S 325 0.2167 111 0.81 40
IV.SEI.HHZ. 2021-05-25T00:53:37.10 0.6 undecidable manual S 245 0.1925 113 0.32 47
IV.ASQU.HHE. 2021-05-25T00:53:36.48 0.1 undecidable manual P 158 0.3651 50 -0.14 95
IV.FAZ.HNZ. 2021-05-25T00:53:36.84 3.0 undecidable manual P 0
IV.BRIS.HHZ. 2021-05-25T00:53:35.27 0.6 undecidable manual S 53 0.1484 119 0.02 51
IV.RUFI.EHN. 2021-05-25T00:53:35.23 0.1 undecidable manual P 192 0.3049 50 -0.36 91
IV.SFI.EHE. 2021-05-25T00:53:35.11 0.1 undecidable manual P 143 0.2914 50 -0.24 94
IV.FAEN.HNZ. 2021-05-25T00:53:34.63 0.1 undecidable manual P 52 0.2500 108 0.05 98
IV.VISG.HHZ. 2021-05-25T00:53:34.42 0.6 undecidable manual S 294 0.1304 122 -0.26 48
IV.LMD.HHZ. 2021-05-25T00:53:33.74 0.6 undecidable manual S 127 0.0962 131 0.13 50
IV.SEI.HHZ. 2021-05-25T00:53:33.33 0.1 undecidable manual P 245 0.1925 113 -0.04 100
IV.MTRZ.HNZ. 2021-05-25T00:53:33.89 0.1 undecidable manual P 325 0.2167 111 0.01 100
IV.BRIS.HHZ. 2021-05-25T00:53:32.38 0.1 positive manual P 53 0.1484 119 -0.11 99
IV.LMD.HHZ. 2021-05-25T00:53:31.56 0.6 positive manual P 127 0.0962 131 0.02 51
IV.VISG.HHZ. 2021-05-25T00:53:31.98 0.1 undecidable manual P 294 0.1304 122 -0.18 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHN. ML:0.8 0.00007305 0.22 AML other m 2021-05-25T00:53:33.87
IV.LMD.HHE. ML:0.7 0.00005895 1.06 AML other m 2021-05-25T00:53:34.82
IV.VISG.HHE. ML:0.7 0.000048799999999999994 0.12 AML other m 2021-05-25T00:53:34.60
IV.VISG.HHN. ML:0.7 0.00005185 1.16 AML other m 2021-05-25T00:53:34.07
IV.BRIS.HHE. ML:1.3 0.000185 0.36 AML other m 2021-05-25T00:53:35.52
IV.BRIS.HHN. ML:1.4 0.000251 0.22 AML other m 2021-05-25T00:53:35.52
IV.SEI.HHE. ML:0.9 0.000055507215 0.44 AML other m 2021-05-25T00:53:37.73
IV.SEI.HHN. ML:1.0 0.000073964875 0.3 AML other m 2021-05-25T00:53:38.14
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, http://terremoti.ingv.it/tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download