Earthquake with magnitude of ML 2.1 on date 27-09-2021 and time 04:42:16 (Italy) in region 1 km W Davagna (GE)

A magnitude ML 2.1 earthquake occured in region: 1 km W Davagna (GE), on

  • 27-09-2021 02:42:16 (UTC)
  • 27-09-2021 04:42:16 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.461, 9.073 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
Davagna GE 1 1884 1884
Bargagli GE 2 2708 4592
Lumarzo GE 6 1535 6127
Montoggio GE 7 2067 8194
Sant'Olcese GE 9 5906 14100
Uscio GE 9 2284 16384
Bogliasco GE 9 4488 20872
Torriglia GE 9 2311 23183
Neirone GE 9 916 24099
Pieve Ligure GE 10 2544 26643
Sori GE 10 4205 30848
Casella GE 10 3144 33992
Valbrevenna GE 11 798 34790
Tribogna GE 11 614 35404
Avegno GE 11 2525 37929
Moconesi GE 12 2614 40543
Serra Riccò GE 12 7885 48428
Genova GE 12 586655 635083
Recco GE 12 9752 644835
Savignone GE 13 3205 648040
Cicagna GE 14 2502 650542
Camogli GE 14 5378 655920
Crocefieschi GE 14 548 656468
Mignanego GE 15 3675 660143
Propata GE 15 142 660285
Favale di Malvaro GE 15 466 660751
Ceranesi GE 15 3875 664626
Campomorone GE 15 6996 671622
Vobbia GE 16 409 672031
Busalla GE 16 5563 677594
Montebruno GE 16 240 677834
Rondanina GE 16 62 677896
Lorsica GE 16 468 678364
Orero GE 17 565 678929
Coreglia Ligure GE 17 285 679214
Fascia GE 17 81 679295
Rapallo GE 18 29796 709091
Santa Margherita Ligure GE 18 9338 718429
Ronco Scrivia GE 19 4417 722846
Carrega Ligure AL 20 84 722930
Mongiardino Ligure AL 20 165 723095

Municipalities with at least 50000 inhabitants

An earthquake occurred to
12 Km E of Genova (586655 inhabitants)
50 Km E of Savona (61345 inhabitants)
62 Km SE of Alessandria (93943 inhabitants)
72 Km NW of La Spezia (93959 inhabitants)
81 Km S of Pavia (72576 inhabitants)
82 Km SW of Piacenza (102191 inhabitants)
84 Km SE of Asti (76202 inhabitants)
92 Km W of Carrara (63133 inhabitants)
97 Km S of Vigevano (63310 inhabitants)
97 Km W of Massa (69479 inhabitants)
Recent and historical seismicity

These maps show the seismicity for different time windows. The earthquake locations reported in these maps are determined in quasi real-time by the personnel on duty in the seismic surveillance center of INGV in Rome. Note that the earthquake source parameters (hypocentral location and magnitude) are the best estimates obstained with the available data and they are adjourned as additional data become available. The source parameters obtained by the personnel on duty are then revised by the group in charge of the INGV Seismic Bulletin (Bollettino Sismico Italiano dell’INGV).

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map reports the earthquake epicenters located in the 72 hours (3 days) preceding the time of the current earthquake occurrence, using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radius of the circle representing the earthquake on the map scales with magnitude. The color depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours). The open star shows the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map reports the Magnitudo ≥ 1.0 earthquake epicenters located in the 90 days preceding the time of the current earthquake occurrence, using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows 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 reports the Magnitudo ≥ 2.5 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows 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 https://emidius.mi.ingv.it/CPTI15-DBMI15/) with estimated magnitude ≥ 5.0 since 1000 AD until 2014. The epicenters are represented by squares which sides scale with the estimated earthquake magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The open star shows 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
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 2.1 2021-09-27
02:42:16
44.461 9.0732 9 2021-09-27
02:51:25
Sala Sismica INGV-Roma 95925311
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-27 02:42:16 ± 0.12
Latitude 44.4610 ± 0.0090
Longitude 9.0732 ± 0.0088
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 95925311

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 999
Semi-minor axis of confidence ellipse (meter) 552
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 161
Circular confidence region, given by single value of horizontal uncertainty (meter) 1000
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 119
Number of associated phases, regardless of their use for origin computation 33
Number of defining phases 29
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.32
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 1.4542
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 18
Magnitude information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.3
Num. used stations 34
Type of magnitude ML
Reference to an origin 95925311
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-27 02:51:25
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MMUR.HNZ. 2021-09-27T02:43:51.60 3.0 undecidable manual Sn 4.88 0
SI.LUSI.HHZ. 2021-09-27T02:43:18.69 3.0 undecidable manual Sn -1.76 0
GU.MGRO.HHZ. 2021-09-27T02:42:49.76 0.6 undecidable manual S 246 0.9973 50 1.12 29
GU.GBOS.HHZ. 2021-09-27T02:42:46.38 0.6 undecidable manual S 256 0.9083 50 0.38 40
IV.SGAL.EHZ. 2021-09-27T02:42:44.38 3.0 undecidable manual P -0.26 0
IV.MDI.HHZ. 2021-09-27T02:42:43.40 3.0 negative manual P -0.38 0
GU.PZZ.HHZ. 2021-09-27T02:42:42.06 0.3 undecidable manual P 273 1.3966 50 0.32 53
GU.RORO.HHZ. 2021-09-27T02:42:42.32 0.6 undecidable manual S 245 0.7995 50 -0.47 40
GU.RSP.HHZ. 2021-09-27T02:42:42.46 0.6 undecidable manual P 299 1.4542 50 -0.28 35
GU.STV.HHZ. 2021-09-27T02:42:39.15 0.6 undecidable manual P 261 1.2671 50 -0.38 37
GU.ROTM.HHZ. 2021-09-27T02:42:39.07 0.6 undecidable manual S 307 0.643 50 0.93 34
GU.CANO.HHZ. 2021-09-27T02:42:38.54 0.6 undecidable manual S 247 0.6493 50 0.22 44
GU.ENR.HHZ. 2021-09-27T02:42:38.26 1.0 positive manual P 260 1.2051 50 -0.21 19
GU.IMI.HHZ. 2021-09-27T02:42:35.39 0.1 undecidable manual P 237 1.009 50 0.28 80
GU.MGRO.HHZ. 2021-09-27T02:42:35.15 0.3 undecidable manual P 246 0.9973 50 0.23 61
IV.QLNO.HHZ. 2021-09-27T02:42:34.74 0.6 undecidable manual S 256 0.5369 50 -0.26 44
GU.GBOS.HHZ. 2021-09-27T02:42:33.30 0.1 undecidable manual P 256 0.9083 50 -0.09 85
GU.RORO.HHZ. 2021-09-27T02:42:31.30 0.1 undecidable manual P 245 0.7995 50 -0.24 84
IV.BOB.HHE. 2021-09-27T02:42:30.65 0.6 undecidable manual S 41 0.4065 50 -0.48 43
IV.MSSA.HHE. 2021-09-27T02:42:29.09 0.6 undecidable manual S 114 0.3489 50 -0.33 45
GU.ROTM.HHZ. 2021-09-27T02:42:28.97 0.1 negative manual P 307 0.643 50 0.12 89
GU.CANO.HHZ. 2021-09-27T02:42:28.64 0.6 positive manual P 247 0.6493 50 -0.32 43
IV.QLNO.HHZ. 2021-09-27T02:42:26.54 0.1 negative manual P 256 0.5369 50 -0.5 84
IV.SARZ.HHZ. 2021-09-27T02:42:25.52 0.1 positive manual P 344 0.4218 50 0.45 87
IV.BOB.HHE. 2021-09-27T02:42:24.93 0.1 undecidable manual P 41 0.4065 50 0.12 94
IV.MSSA.HHE. 2021-09-27T02:42:24.05 0.1 undecidable manual P 114 0.3489 50 0.23 93
GU.PCP.HHZ. 2021-09-27T02:42:23.56 0.1 negative manual P 282 0.3849 50 -0.87 75
GU.GENL.EHZ. 2021-09-27T02:42:21.13 0.6 undecidable manual S 233 0.0926 131 0.24 49
IT.GNV.HGZ. 2021-09-27T02:42:21.14 0.6 undecidable manual S 254 0.1052 128 -0.13 50
GU.RNCA.HHZ. 2021-09-27T02:42:20.19 0.6 undecidable manual S 277 0.0872 133 -0.56 45
IT.GNV.HGZ. 2021-09-27T02:42:19.27 0.3 negative manual P 254 0.1052 128 0.16 74
GU.GENL.EHZ. 2021-09-27T02:42:19.27 0.1 positive manual P 233 0.0926 131 0.38 94
GU.RNCA.HHZ. 2021-09-27T02:42:18.71 0.1 undecidable manual P 277 0.0872 133 -0.11 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.GENL.EHN. ML:2.6 0.00533 0.34 AML other m 2021-09-27T02:42:21.40
GU.GENL.EHE. ML:2.4 0.003015 0.42 AML other m 2021-09-27T02:42:21.62
GU.PCP.HHN. ML:1.8 0.000183 0.24 AML other m 2021-09-27T02:42:29.59
GU.PCP.HHE. ML:1.6 0.0001325 1.34 AML other m 2021-09-27T02:42:31.69
IV.SARZ.HHN. ML:2.2 0.000508 1.18 AML other m 2021-09-27T02:42:34.90
IV.QLNO.HHN. ML:1.7 9.83E-5 0.68 AML other m 2021-09-27T02:42:35.42
IV.SARZ.HNN. ML:2.2 0.0005305 0.3 AML other m 2021-09-27T02:42:35.34
IV.QLNO.HHE. ML:1.7 0.0001035 0.66 AML other m 2021-09-27T02:42:36.33
IV.SARZ.HHE. ML:2.2 0.0004715 0.36 AML other m 2021-09-27T02:42:37.52
IV.SARZ.HNE. ML:2.2 0.0004915 0.38 AML other m 2021-09-27T02:42:37.53
GU.CANO.HHN. ML:2.4 0.0004055 0.42 AML other m 2021-09-27T02:42:39.30
GU.CANO.HHE. ML:2.3 0.000332 1.06 AML other m 2021-09-27T02:42:40.60
GU.STV.HHE. ML:1.6 2.3105855E-5 0.36 AML other m 2021-09-27T02:43:02.01
IV.MDI.HHE. ML:1.9 3.418581E-5 0.7008 AML other m 2021-09-27T02:43:04.52
IV.MDI.HHN. ML:2 5.1599195E-5 3.92 AML other m 2021-09-27T02:43:07.20
GU.ROTM.HHE. ML:2.3 0.0003245 1.46 AML other m 2021-09-27T02:42:44.07
GU.ROTM.HHN. ML:2.4 0.0004435 0.62 AML other m 2021-09-27T02:42:46.69
GU.GBOS.HHE. ML:1.8 6.435E-5 0.46 AML other m 2021-09-27T02:42:48.24
GU.GBOS.HHN. ML:1.9 7.95E-5 0.38 AML other m 2021-09-27T02:42:48.12
GU.MGRO.HHE. ML:2 7.895E-5 1.14 AML other m 2021-09-27T02:42:50.15
GU.IMI.HHE. ML:2.1 9.89E-5 0.68 AML other m 2021-09-27T02:42:51.67
GU.IMI.HHN. ML:2.4 0.0002215 0.34 AML other m 2021-09-27T02:42:51.80
GU.MGRO.HHN. ML:2 7.96E-5 1.46 AML other m 2021-09-27T02:42:53.90
GU.ENR.HHN. ML:1.9 4.34E-5 1.1 AML other m 2021-09-27T02:42:58.35
GU.ENR.HHE. ML:1.8 3.38E-5 0.44 AML other m 2021-09-27T02:43:00.44
GU.STV.HHN. ML:1.7 2.98E-5 0.78 AML other m 2021-09-27T02:43:00.91
GU.PZZ.HHE. ML:2.1 5.77E-5 0.52 AML other m 2021-09-27T02:43:02.74
IV.SGAL.EHE. ML:2.2 8.47E-5 0.38 AML other m 2021-09-27T02:43:04.67
IV.SGAL.EHN. ML:2.1 5.555E-5 1.64 AML other m 2021-09-27T02:43:04.90
GU.PZZ.HHN. ML:2 5.13E-5 0.7 AML other m 2021-09-27T02:43:08.58
SI.LUSI.HHN. ML:2.3 4.99E-5 1.18 AML other m 2021-09-27T02:43:26.61
SI.LUSI.HHE. ML:2 2.525E-5 0.8 AML other m 2021-09-27T02:43:27.67
GU.RNCA.HHE. ML:2.6 0.005319639 0.12 AML other m 2021-09-27T02:42:20.31
GU.RNCA.HHN. ML:2.6 0.005985293 0.16 AML other m 2021-09-27T02:42:20.31
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

This map reports the focal mechanisms since 1977 in the region. The white and red beach ball symbols are mechanisms determined using the Regional Centroid Moment Tensor (RCMT, http://www.bo.ingv.it/RCMT) and are determined for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when there is a good source-receiver geometry of the target earthquake, the RCMT can be obtained also for earthquakes with magnitude larger than 4.0. The blue and white beach ball symbols indicate the mechanisms obtained from application of the Time Domain Moment Tensor (TDMT, http://terremoti.ingv.it/tdmt.html). This technique is used for M ≥ 3.5. The size of the beach ball sysmbol 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
Waveforms Seismic signals in miniseed + resp format Download