Earthquake with magnitude of ML 2.0 on date 11-09-2020 and time 10:21:07 (UTC) in region 3 km E Tassarolo (AL)

A magnitude ML 2.0 earthquake occured in region: 3 km E Tassarolo (AL), on

  • 11-09-2020 10:21:07 (UTC)
  • 11-09-2020 12:21:07 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.72, 8.81 at 27 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
Tassarolo AL 4 672 672
Serravalle Scrivia AL 4 6128 6800
Gavi AL 4 4614 11414
Stazzano AL 4 2486 13900
Novi Ligure AL 5 28154 42054
Pasturana AL 6 1318 43372
San Cristoforo AL 6 608 43980
Cassano Spinola AL 6 1731 45711
Vignole Borbera AL 6 2182 47893
Francavilla Bisio AL 7 531 48424
Arquata Scrivia AL 7 6409 54833
Parodi Ligure AL 7 715 55548
Carrosio AL 7 510 56058
Gavazzana AL 8 180 56238
Sardigliano AL 8 406 56644
Pozzolo Formigaro AL 8 4775 61419
Bosio AL 9 1227 62646
Montaldeo AL 9 265 62911
Castelletto d'Orba AL 10 2047 64958
Capriata d'Orba AL 10 1904 66862
Basaluzzo AL 10 2087 68949
Mornese AL 10 737 69686
Borghetto di Borbera AL 11 1966 71652
Sant'Agata Fossili AL 11 425 72077
Villalvernia AL 11 955 73032
Carezzano AL 12 431 73463
Voltaggio AL 12 738 74201
Casaleggio Boiro AL 12 372 74573
Silvano d'Orba AL 12 1988 76561
Fresonara AL 12 731 77292
Grondona AL 12 510 77802
Paderna AL 12 220 78022
Castellania AL 13 90 78112
Lerma AL 13 869 78981
Predosa AL 13 2048 81029
Spineto Scrivia AL 14 337 81366
Costa Vescovato AL 14 335 81701
Isola del Cantone GE 14 1540 83241
Rocca Grimalda AL 14 1512 84753
Tagliolo Monferrato AL 15 1581 86334
Carbonara Scrivia AL 15 1122 87456
Avolasca AL 15 294 87750
Bosco Marengo AL 15 2457 90207
Villaromagnano AL 15 715 90922
Fraconalto AL 16 336 91258
Garbagna AL 16 696 91954
Cerreto Grue AL 16 323 92277
Ovada AL 16 11477 103754
Belforte Monferrato AL 16 515 104269
Frugarolo AL 17 1968 106237
Montegioco AL 17 313 106550
Ronco Scrivia GE 17 4417 110967
Carpeneto AL 17 977 111944
Roccaforte Ligure AL 18 136 112080
Sarezzano AL 18 1171 113251
Cantalupo Ligure AL 18 527 113778
Montaldo Bormida AL 18 664 114442
Rocchetta Ligure AL 19 200 114642
Trisobbio AL 19 655 115297
Casasco AL 19 129 115426
Dernice AL 19 185 115611
Tortona AL 19 27437 143048
Casal Cermelli AL 20 1234 144282
Busalla GE 20 5563 149845
Montemarzino AL 20 341 150186

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km SE of Alessandria (93943 inhabitants)
36 Km N of Genova (586655 inhabitants)
52 Km E of Asti (76202 inhabitants)
53 Km NE of Savona (61345 inhabitants)
58 Km SW of Pavia (72576 inhabitants)
66 Km S of Vigevano (63310 inhabitants)
78 Km W of Piacenza (102191 inhabitants)
82 Km S of Novara (104380 inhabitants)
88 Km SW of Milano (1345851 inhabitants)
91 Km S of Rho (50434 inhabitants)
94 Km E of Moncalieri (57294 inhabitants)
96 Km SW of Sesto San Giovanni (81608 inhabitants)
97 Km S of Legnano (60262 inhabitants)
97 Km E of Torino (890529 inhabitants)
98 Km SW of Cinisello Balsamo (75078 inhabitants)
99 Km S of Busto Arsizio (83106 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 last three days (72 hours)

Earthquakes of the last three days (72 hours)

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 last 90 days

Earthquakes of the last 90 days

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 since 1985

Earthquakes since 1985

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 2014

Earthquakes since 1000 AD until 2014

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
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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 2.0 2020-09-11
10:21:07
44.72 8.81 27 2020-09-11
10:36:42
Sala Sismica INGV-Roma 82814571
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-11 10:21:07 ± 0.29
Latitude 44.72 ± 0.01
Longitude 8.81 ± 0.01
Depth (km) 27 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 82814571

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 942
Semi-minor axis of confidence ellipse (meter) 530
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 52
Circular confidence region, given by single value of horizontal uncertainty (meter) 940
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 95
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.52071
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 8
Magnitude information

ML:2

Field Value
Value 2
Uncertainty 0.3
Num. used stations 20
Type of magnitude ML
Reference to an origin 82814571
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-11 10:36:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ROSPO.HHZ. 2020-09-11T10:22:40.58 3.0 undecidable manual Pg 18.16 0
IV.PE3.EHZ. 2020-09-11T10:22:29.67 3.0 undecidable manual Sn 4.54 0
IV.SGG.HHZ. 2020-09-11T10:22:24.20 3.0 undecidable manual Pn -0.63 0
IV.MOCL.EHZ. 2020-09-11T10:22:06.21 3.0 undecidable manual Sg 5.41 0
IV.MTCE.HHZ. 2020-09-11T10:22:05.75 3.0 positive manual Pn -0.81 0
IV.ARVD.HHZ. 2020-09-11T10:21:54.07 3.0 positive manual Pn -2.41 0
ST.RONC.EHZ. 2020-09-11T10:21:39.01 3.0 negative manual Pn 2.07 0
IV.MILN.HNZ. 2020-09-11T10:21:35.57 3.0 undecidable manual S -0.35 0
IV.ZCCA.HHZ. 2020-09-11T10:21:33.89 3.0 positive manual Pn -0.23 0
GU.ENR.HHZ. 2020-09-11T10:21:30.64 3.0 undecidable manual Pg 1.55 0
GU.CIRO.HHZ. 2020-09-11T10:21:29.91 3.0 positive manual Pn -0.65 0
GU.TRAV.HHZ. 2020-09-11T10:21:28.92 3.0 negative manual Pg 0.46 0
GU.GORR.HHZ. 2020-09-11T10:21:22.08 0.3 undecidable manual S 109 0.3597 118 -0.12 74
GU.ROTM.HHZ. 2020-09-11T10:21:22.41 0.3 undecidable manual S 291 0.3507 119 0.45 69
GU.RNCA.HHZ. 2020-09-11T10:21:20.20 0.3 undecidable manual S 159 0.2707 127 0.22 73
IT.GNV.HGE. 2020-09-11T10:21:20.88 0.3 undecidable manual S 164 0.304 123 0.1 75
GU.PCP.HHZ. 2020-09-11T10:21:19.39 0.3 undecidable manual S 226 0.2644 127 -0.43 71
IV.QLNO.HHE. 2020-09-11T10:21:18.38 1.0 undecidable manual P 220 0.5207 109 -0.34 23
IV.BOB.HHE. 2020-09-11T10:21:18.02 0.3 undecidable manual P 84 0.4515 112 0.4 69
IV.SARZ.HHZ. 2020-09-11T10:21:17.53 0.3 undecidable manual S 26 0.1592 143 -0.08 78
GU.GORR.HHZ. 2020-09-11T10:21:16.15 0.1 undecidable manual P 109 0.3597 118 -0.04 100
GU.ROTM.HHZ. 2020-09-11T10:21:16.45 0.1 undecidable manual P 291 0.3507 119 0.4 93
IT.GNV.HGE. 2020-09-11T10:21:15.53 0.1 undecidable manual P 164 0.304 123 0.16 99
GU.PCP.HHZ. 2020-09-11T10:21:14.53 0.1 positive manual P 226 0.2644 127 -0.29 97
GU.RNCA.HHZ. 2020-09-11T10:21:14.75 0.1 undecidable manual P 159 0.2707 127 -0.16 100
IV.ACQ.HGZ. 2020-09-11T10:21:13.96 3.0 undecidable manual P 0
IV.SARZ.HHZ. 2020-09-11T10:21:13.22 0.1 undecidable manual P 26 0.1592 143 -0.32 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SARZ.HHN. ML:0 0.001230033 0.2368 AML other m 2020-09-11T10:21:18.12
IV.SARZ.HNN. ML:0 0.00121232 0.256 AML other m 2020-09-11T10:21:18.24
IV.SARZ.HHE. ML:0 0.00089621175 0.256 AML other m 2020-09-11T10:21:20.86
IV.SARZ.HNE. ML:0 0.000864214 0.2368 AML other m 2020-09-11T10:21:20.86
GU.RNCA.HHN. ML:0 0.0002657078 0.2176 AML other m 2020-09-11T10:21:21.61
GU.RNCA.HHE. ML:0 0.0003024883 0.2432 AML other m 2020-09-11T10:21:21.08
GU.PCP.HHE. ML:1.7 0.0001891004 0.3584 AML other m 2020-09-11T10:21:19.60
GU.PCP.HHN. ML:1.6 0.0001444259 0.2432 AML other m 2020-09-11T10:21:19.76
GU.GORR.HHE. ML:1.8 0.00019144405 0.2816 AML other m 2020-09-11T10:21:22.40
GU.GORR.HHN. ML:1.7 0.00013664365 0.4032 AML other m 2020-09-11T10:21:26.01
GU.ROTM.HHE. ML:2.1 0.0003645396 0.3008 AML other m 2020-09-11T10:21:29.97
GU.ROTM.HHN. ML:2.3 0.00060009625 0.48 AML other m 2020-09-11T10:21:23.63
GU.TRAV.HHE. ML:2 7.4192005E-5 0.1984 AML other m 2020-09-11T10:21:44.39
GU.TRAV.HHN. ML:2 7.471214E-5 0.1984 AML other m 2020-09-11T10:21:46.10
GU.CIRO.HHE. ML:1.5 2.212272E-5 0.096 AML other m 2020-09-11T10:21:49.40
GU.CIRO.HHN. ML:1.9 4.4371565E-5 0.2368 AML other m 2020-09-11T10:21:48.63
GU.ENR.HHE. ML:1.6 2.4445735E-5 0.1216 AML other m 2020-09-11T10:21:47.70
GU.ENR.HHN. ML:1.7 3.301493E-5 0.3584 AML other m 2020-09-11T10:21:47.35
IV.ZCCA.HNE. ML:2.6 0.0001384901 0.6592 AML other m 2020-09-11T10:21:37.77
IV.ARVD.HHN. ML:2.1 1.14475075E-5 0.0576 AML other m 2020-09-11T10:21:59.57
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Focal Mechanisms

Focal Mechanisms

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 full SEED format Download