Earthquake with magnitude of ML 1.9 on date 30-09-2021 and time 02:02:52 (Italy) in region 1 km SE Savignone (GE)

A magnitude ML 1.9 earthquake occured in region: 1 km SE Savignone (GE), on

  • 30-09-2021 00:02:52 (UTC)
  • 30-09-2021 02:02:52 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.5550, 9.0000 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Savignone GE 1 3205 3205
Casella GE 2 3144 6349
Crocefieschi GE 4 548 6897
Busalla GE 5 5563 12460
Valbrevenna GE 5 798 13258
Montoggio GE 6 2067 15325
Vobbia GE 6 409 15734
Ronco Scrivia GE 7 4417 20151
Serra Riccò GE 7 7885 28036
Mignanego GE 7 3675 31711
Sant'Olcese GE 8 5906 37617
Campomorone GE 10 6996 44613
Ceranesi GE 10 3875 48488
Fraconalto AL 10 336 48824
Mongiardino Ligure AL 11 165 48989
Isola del Cantone GE 11 1540 50529
Davagna GE 12 1884 52413
Torriglia GE 13 2311 54724
Roccaforte Ligure AL 14 136 54860
Bargagli GE 14 2708 57568
Voltaggio AL 14 738 58306
Propata GE 15 142 58448
Cabella Ligure AL 15 528 58976
Carrega Ligure AL 16 84 59060
Grondona AL 16 510 59570
Lumarzo GE 17 1535 61105
Genova GE 17 586655 647760
Arquata Scrivia AL 17 6409 654169
Albera Ligure AL 17 325 654494
Rocchetta Ligure AL 17 200 654694
Rondanina GE 17 62 654756
Carrosio AL 18 510 655266
Cantalupo Ligure AL 19 527 655793
Fascia GE 19 81 655874
Neirone GE 19 916 656790
Vignole Borbera AL 19 2182 658972
Bosio AL 19 1227 660199

Municipalities with at least 50000 inhabitants

An earthquake occurred to
17 Km NE of Genova (586655 inhabitants)
49 Km NE of Savona (61345 inhabitants)
50 Km SE of Alessandria (93943 inhabitants)
71 Km S of Pavia (72576 inhabitants)
74 Km SE of Asti (76202 inhabitants)
78 Km SW of Piacenza (102191 inhabitants)
83 Km NW of La Spezia (93959 inhabitants)
86 Km S of Vigevano (63310 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
Bulletin
Rev1000
ML 1.9 2021-09-30
00:02:52
44.5552 8.9997 8 2022-03-30
13:04:08
Bollettino Sismico Italiano INGV 96205381
Reviewed
Rev100
ML 1.8 2021-09-30
00:02:52
44.5472 9.0057 8 2021-09-30
00:13:32
Sala Sismica INGV-Roma 96048001
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-30 00:02:52 ± 0.09
Latitude 44.5552 ± 0.0063
Longitude 8.9997 ± 0.0063
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 96205381

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 653
Semi-minor axis of confidence ellipse (meter) 378
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 160
Circular confidence region, given by single value of horizontal uncertainty (meter) 650.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 67
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.91101
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 15
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 96048001
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-30 00:13:32

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 96205381
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-04 12:48:39
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.PE3.EHZ. 2021-09-30T00:04:10.03 3.0 undecidable manual Sn 2.42 0
IV.LPEL.HHZ. 2021-09-30T00:04:07.85 3.0 undecidable manual Pn 7.41 0
TV.SF04.EHZ. 2021-09-30T00:04:05.62 3.0 undecidable manual Sn 0.11 0
IV.NDIM.HHZ. 2021-09-30T00:03:22.65 3.0 negative manual P 5.14 0
GU.EQUI.HHZ. 2021-09-30T00:03:22.78 0.6 undecidable manual S 115 0.9110 50 -0.17 41
GU.RORO.HHE. 2021-09-30T00:03:19.97 0.3 undecidable manual S 237 0.8004 50 0.31 61
GU.GRAM.HHZ. 2021-09-30T00:03:18.79 0.6 undecidable manual S 94 0.7617 50 0.27 41
GU.CANO.HHZ. 2021-09-30T00:03:15.39 0.3 undecidable manual S 238 0.6457 50 0.3 63
GU.EQUI.HHZ. 2021-09-30T00:03:10.60 0.3 undecidable manual P 115 0.9110 50 0.36 59
IV.MSSA.HHZ. 2021-09-30T00:03:08.37 0.3 undecidable manual S 123 0.4398 50 -0.61 60
IV.PLMA.HHE. 2021-09-30T00:03:08.56 0.6 undecidable manual P 129 0.7923 50 0.35 40
GU.RORO.HHE. 2021-09-30T00:03:08.01 0.3 undecidable manual P 237 0.8004 50 -0.34 61
GU.GRAM.HHZ. 2021-09-30T00:03:08.08 0.3 undecidable manual P 94 0.7617 50 0.39 60
IV.BOB.HNE. 2021-09-30T00:03:07.75 0.6 undecidable manual S 56 0.3831 50 0.45 43
GU.CANO.HHZ. 2021-09-30T00:03:05.42 0.6 undecidable manual P 238 0.6457 50 -0.29 42
IV.SARZ.HHZ. 2021-09-30T00:03:05.62 0.6 undecidable manual S 349 0.3175 50 0.25 45
IV.QLNO.HHE. 2021-09-30T00:03:03.10 0.3 undecidable manual P 244 0.5207 50 -0.46 63
GU.ROTM.HHZ. 2021-09-30T00:03:03.87 0.3 undecidable manual P 303 0.5459 50 -0.12 67
GU.GORR.HHZ. 2021-09-30T00:03:01.33 0.3 undecidable manual S 76 0.2149 109 -0.32 69
IV.MSSA.HHZ. 2021-09-30T00:03:01.93 0.3 undecidable manual P 123 0.4398 50 -0.25 67
IV.BOB.HNE. 2021-09-30T00:03:01.42 0.1 undecidable manual P 56 0.3831 50 0.21 90
IV.SARZ.HHZ. 2021-09-30T00:03:00.52 0.3 undecidable manual P 349 0.3175 50 0.43 66
GU.PCP.HHZ. 2021-09-30T00:02:59.41 0.1 negative manual P 268 0.3238 50 -0.78 77
GU.GENL.EHN. 2021-09-30T00:02:59.63 0.3 undecidable manual S 188 0.1511 116 0.26 70
IT.GNV.HGE. 2021-09-30T00:02:58.91 0.6 undecidable manual S 201 0.1322 119 0.17 48
GU.GORR.HHZ. 2021-09-30T00:02:57.67 0.1 undecidable manual P 76 0.2149 109 -0.27 92
GU.RNCA.HHZ. 2021-09-30T00:02:57.42 0.1 undecidable manual S 202 0.0908 130 0 100
GU.GENL.EHN. 2021-09-30T00:02:56.74 0.3 undecidable manual P 188 0.1511 116 0.11 73
IT.GNV.HGE. 2021-09-30T00:02:56.38 0.1 undecidable manual P 201 0.1322 119 0.11 97
GU.RNCA.HHZ. 2021-09-30T00:02:55.57 0.1 undecidable manual P 202 0.0908 130 0.07 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.RNCA.HHE. ML:1.9 0.0010625 0.14 AML other m 2021-09-30T00:02:57.46
GU.RNCA.HHN. ML:2.0 0.0013399999999999998 0.14 AML other m 2021-09-30T00:02:57.93
GU.GORR.HHE. ML:1.7 0.00032299999999999994 0.58 AML other m 2021-09-30T00:03:02.30
GU.GORR.HHN. ML:1.7 0.0003285 0.96 AML other m 2021-09-30T00:03:03.61
GU.PCP.HHE. ML:1.0 0.000047 0.44 AML other m 2021-09-30T00:03:06.20
GU.PCP.HHN. ML:1.2 0.000064 0.26 AML other m 2021-09-30T00:03:06.18
IV.MSSA.HHE. ML:2.1 0.0003445 0.1 AML other m 2021-09-30T00:03:09.33
IV.SARZ.HHE. ML:1.7 0.000194 1.26 AML other m 2021-09-30T00:03:09.80
IV.MSSA.HHN. ML:2.0 0.0002415 0.1 AML other m 2021-09-30T00:03:10.29
IV.SARZ.HHN. ML:1.8 0.0002385 1.14 AML other m 2021-09-30T00:03:10.67
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