user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: when did the big earthquake hit san francisco? 
Knowledge Triplets: San Francisco, common.topic.subjects, San Francisco Sightseeing
San Francisco, book.book_subject.works, Bindlestiff
San Francisco, common.topic.webpage, m.09wtp55
San Francisco, common.topic.webpage, m.09yb31v
San Francisco, common.topic.webpage, m.0b47y72
San Francisco, common.topic.webpage, m.09w1nrz
San Francisco, book.book_subject.works, Unbound feet
San Francisco, location.statistical_region.population, m.05svk77
San Francisco, location.location.adjoin_s, m.02xlhps
San Francisco, common.topic.webpage, m.0b6rdz3
San Francisco, film.film.edited_by, Tom Held
m.09w8sgp, common.webpage.topic, San Francisco
Balfour Guthrie and Co. San Francisco Office, architecture.structure.destroyed_by, Earthquake
San Francisco, film.film.genre, Disaster Film
San Francisco, common.topic.webpage, m.09ybmx4
m.0b46s2b, common.webpage.topic, San Francisco
m.09y5d51, common.webpage.topic, San Francisco
San Francisco, book.book_subject.works, Tales of the City
San Francisco, location.statistical_region.population, g.12b01lp51
m.0b47y72, common.webpage.topic, San Francisco
1906 San Francisco earthquake, event.disaster.structures_destroyed, Palace Hotel, San Francisco
San Francisco, common.topic.webpage, m.09wg_8f
m.0qymvcv, dataworld.gardening_hint.last_referenced_by, 1906 San Francisco earthquake
m.09xyfmk, common.webpage.topic, San Francisco
San Francisco, film.film.film_festivals, 1985 Berlin International Film Festival
San Francisco, book.book_subject.works, Savages
m.02kpz3y, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09wtp9c
m.09yvkr0, common.webpage.topic, San Francisco
m.09ykksd, common.webpage.topic, San Francisco
m.09xk6vh, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09y60fg
San Francisco, location.location.adjoin_s, m.02xlhpn
San Francisco, book.book_subject.works, 7th Heaven
San Francisco, location.location.adjoin_s, m.02xlhq8
m.09wm0d1, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09yxjs0
San Francisco, common.topic.webpage, m.09y228s
San Francisco, common.topic.webpage, m.022q11g
m.09x1nxq, common.webpage.topic, San Francisco
San Andreas Fault, user.robert.earthquakes.seismic_fault.earthquakes, 1906 San Francisco earthquake
m.0b46cf9, common.webpage.topic, San Francisco
m.09xmh4d, common.webpage.topic, San Francisco
m.09wtp9c, common.webpage.topic, San Francisco
1906 San Francisco earthquake, user.robert.earthquakes.earthquake.total_damage, m.03rtjky
m.09wt6tt, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09y9bqs
m.09y228s, common.webpage.topic, San Francisco
San Francisco, book.book_subject.works, The 6th Target
San Francisco, common.topic.webpage, m.094t_kq
San Francisco, book.book_subject.works, Herb Caen's San Francisco: 1976-1991
m.0cj8mwt, common.webpage.topic, San Francisco
m.02_w9xr, user.robert.earthquakes.earthquake_magnitude.earthquake, 1906 San Francisco earthquake
San Francisco Fire Sacramento Street 1906-04-18, common.image.appears_in_topic_gallery, Looking Down Sacramento Street, San Francisco, April 18, 1906
m.09wpgp4, common.webpage.topic, San Francisco
1906 San Francisco earthquake, time.event.locations, San Francisco
San Francisco Fire Sacramento Street 1906-04-18, common.image.appears_in_topic_gallery, 1906 San Francisco earthquake
San Francisco, common.topic.webpage, m.09yj4m3
San Francisco, common.topic.webpage, m.02kpz46
m.0b6rdz3, common.webpage.topic, San Francisco
m.09x6llg, common.webpage.topic, San Francisco
m.09y9bqs, common.webpage.topic, San Francisco
m.09x3mn3, common.webpage.topic, San Francisco
m.09yxjs0, common.webpage.topic, San Francisco
m.09w1nrz, common.webpage.topic, San Francisco
San Francisco, base.biblioness.bibs_topic.is_really, San Francisco
San Francisco, location.location.adjoin_s, m.09jx37x
m.09y948d, common.webpage.topic, San Francisco
Jack London, event.disaster_survivor.survived_disasters, 1906 San Francisco earthquake
1906 San Francisco earthquake, event.disaster.surviving_structures, Palace Hotel, San Francisco
m.094t_kq, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09yt_t_
A Crack in the Edge of the World: America and the Great California Earthquake of 1906, common.topic.notable_for, g.1256bxdws
San Francisco, common.topic.article, m.022q0vq
San Francisco, location.location.partiallycontains, m.0zwsh__
San Francisco, location.location.adjoin_s, m.02xlhpx
San Francisco, common.topic.webpage, m.09x3mn3
m.09wlk8m, common.webpage.topic, San Francisco
A Crack in the Edge of the World: America and the Great California Earthquake of 1906, book.book.editions, The professor and the madman : a tale of murder, insanity, and the making of the Oxford English dictionary
m.09y632v, common.webpage.topic, San Francisco
San Francisco, common.topic.notable_for, g.1255z32m2
Earthquake, architecture.destruction_method.structures_destroyed, Palace Hotel, San Francisco
San Francisco, location.location.adjoin_s, m.046cwy9
m.09w6wtc, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09x6llg
San Francisco, book.book_subject.works, The Golden Gate
m.022q11g, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.0b46s2b
San Francisco, common.topic.webpage, m.0b48qmn
m.0fpsk0j, common.webpage.topic, San Francisco
m.09yp6yq, common.webpage.topic, San Francisco
Looking Down Sacramento Street, San Francisco, April 18, 1906, base.newsevents.photograph.photographer, Arnold Genthe
m.09y9lh7, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09x70ns
San Francisco, common.topic.webpage, m.09x5l82
San Francisco, common.topic.webpage, m.09ykr7w
San Francisco, common.topic.webpage, m.09y5c2z
San Francisco, common.topic.webpage, m.09x3sv5
San Francisco, common.image.appears_in_topic_gallery, San Francisco
1906 San Francisco earthquake, book.book_subject.works, Locked Rooms
1906 San Francisco earthquake, event.disaster.surviving_structures, San Francisco Mint (structure)
San Francisco, book.book_subject.works, Scenarios
San Francisco SEO, common.topic.subjects, San Francisco Bay Area
m.09x4f_j, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09xlcpd
San Francisco, film.film.subjects, 1906 San Francisco earthquake
San Francisco, common.topic.webpage, m.09ytjk1
After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire, common.topic.article, m.0649cq2
San Francisco, common.topic.webpage, m.09ybqp0
San Francisco, common.topic.webpage, m.09xyfmk
San Francisco, common.topic.webpage, m.09x3hrs
San Francisco, common.topic.webpage, m.09wyt0j
Memory-Song Painted Gold: for the Blue Yusef Lateef (1920-2013), common.topic.subjects, San Francisco
San Francisco, book.book_subject.works, Zodiac
San Francisco, common.topic.image, San Francisco Skyline
m.0b48njf, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09wmxdf
San Francisco, book.book_subject.works, Memory-Song Painted Gold: for the Blue Yusef Lateef (1920-2013)
San Francisco, common.topic.webpage, m.09w1wgb
Westin St. Francis, event.disaster_affected_structure.survived_disasters, 1906 San Francisco earthquake
Simon Winchester, book.author.book_editions_published, A Crack in the Edge of the World: America and the Great California Earthquake of 1906
m.09xjwn2, common.webpage.topic, San Francisco
m.09ytjp2, common.webpage.topic, San Francisco
m.09y22fm, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09y632v
1906 San Francisco earthquake, base.schemastaging.context_name.pronunciation, g.125_nh8xf
After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire, book.written_work.subjects, 1906 San Francisco earthquake
m.02_wb57, user.robert.earthquakes.earthquake_nearest_location.earthquake, 1906 San Francisco earthquake
After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire, book.written_work.author, Mark Klett
San Francisco, book.book_subject.works, Crazybone
m.09w8dlz, common.webpage.topic, San Francisco
San Francisco, location.location.adjoin_s, m.02xlhqd
Simon Winchester, book.author.works_written, A Crack in the Edge of the World: America and the Great California Earthquake of 1906
Earthquake, common.topic.image, Quake epicenters 1963-98
1906 San Francisco earthquake, base.newsevents.photographed_event.photograph_s, Looking Down Sacramento Street, San Francisco, April 18, 1906
San Francisco, common.topic.webpage, m.09y56v7
m.09wmxdf, common.webpage.topic, San Francisco
m.09y4yjk, common.webpage.topic, San Francisco
Looking Down Sacramento Street, San Francisco, April 18, 1906, common.topic.image, San Francisco Fire Sacramento Street 1906-04-18
m.09y978r, common.webpage.topic, San Francisco
m.09y9t54, common.webpage.topic, San Francisco
A Crack in the Edge of the World: America and the Great California Earthquake of 1906, book.written_work.author, Simon Winchester
m.0b48p4h, common.webpage.topic, San Francisco
m.09w1wgb, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09y22fm
San Francisco, location.location.adjoin_s, m.02xlhq4
m.0b48ht8, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.0b48bk0
San Francisco, common.topic.webpage, m.09w6wtc
San Francisco, common.topic.webpage, m.09yvkr0
1906 San Francisco earthquake, event.disaster.surviving_structures, Westin St. Francis
1906 San Francisco earthquake, book.book_subject.works, After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire
m.09wyt0j, common.webpage.topic, San Francisco
A Crack in the Edge of the World: America and the Great California Earthquake of 1906, book.written_work.subjects, 1906 San Francisco earthquake
m.09wf1j0, common.webpage.topic, San Francisco
1906 San Francisco earthquake, user.robert.earthquakes.earthquake.fault, San Andreas Fault
San Francisco Fire Sacramento Street 1906-04-18, common.image.size, m.02c68gh
m.09ychf9, common.webpage.topic, San Francisco
After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire, common.topic.notable_types, Book
San Francisco, common.topic.webpage, m.0b48njf
San Francisco, location.statistical_region.rent50_3, m.05g9fkl
m.09x0gnt, common.webpage.topic, San Francisco
After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire, book.written_work.subjects, Photography
The San Francisco Examiner, book.newspaper.circulation_areas, San Francisco
San Francisco, book.book_subject.works, 1st to Die
San Francisco, common.topic.subject_of, Memory-Song Painted Gold: for the Blue Yusef Lateef (1920-2013)
San Francisco, common.topic.webpage, m.0b46cf9
1906 San Francisco earthquake, event.disaster.type_of_disaster, Earthquake
San Francisco, location.location.adjoin_s, m.02xlhq0
Herb Caen's San Francisco: 1976-1991, book.written_work.original_language, English Language
San Francisco, common.topic.webpage, m.09y39v1
San Francisco, location.statistical_region.rent50_0, m.05g9fjy
1906 San Francisco earthquake, event.disaster.areas_affected, San Francisco
San Francisco, common.topic.webpage, m.09yp6yq
m.09xzf2y, common.webpage.topic, San Francisco
Looking Down Sacramento Street, San Francisco, April 18, 1906, common.topic.notable_for, g.125cqdww9
m.09y72nh, common.webpage.topic, San Francisco
San Francisco, book.book_subject.works, The Bell Tower
m.0b48qmn, common.webpage.topic, San Francisco
1906 San Francisco earthquake, event.disaster.fatalities, 3000
m.09wjmzw, common.webpage.topic, San Francisco
San Francisco, book.book_subject.works, The Lights of Earth
The Great Earthquake and Firestorms of 1906, book.written_work.subjects, California
San Francisco, common.topic.webpage, m.09y4yjk
San Francisco, common.topic.webpage, m.09ylkyw
m.03ll53z, common.webpage.topic, San Francisco
Palace Hotel, San Francisco, event.disaster_affected_structure.destroyed_by_disaster, 1906 San Francisco earthquake
m.0b4827b, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09wq6jn
The Great Earthquake and Firestorms of 1906, common.topic.notable_types, Book
San Francisco, location.statistical_region.population, m.05tyd8s
Herb Caen's San Francisco: 1976-1991, common.topic.notable_types, Book
San Francisco, common.topic.webpage, m.09yv5y4
m.09xlcpd, common.webpage.topic, San Francisco
The Great Earthquake and Firestorms of 1906, book.written_work.subjects, San Francisco
San Francisco, common.topic.webpage, m.09x0gnt
San Francisco, common.topic.webpage, m.09ytjp2
Post-and-Grant-Avenue, common.image.appears_in_topic_gallery, 1906 San Francisco earthquake
m.09y204d, common.webpage.topic, San Francisco
1906 San Francisco earthquake, user.robert.earthquakes.earthquake.date_and_time, 1906-04-18T13:12:00Z
m.09x3hrs, common.webpage.topic, San Francisco
San Francisco, book.book_subject.works, Oh the Glory of It All
m.09wpzr3, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.0cj8mwt
San Francisco, common.topic.webpage, m.0g_qdd6
San Francisco, common.topic.webpage, m.09y5d51
San Francisco, book.book_subject.works, Only in San Francisco
San Francisco, common.topic.webpage, m.09wz41k
1906 San Francisco earthquake, user.robert.earthquakes.earthquake.fatalities, m.02_w95l
After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire, book.book.editions, After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire
San Francisco, common.topic.subjects, http://www.sanfranciscosightseeing.com/
m.09w1w0k, common.webpage.topic, San Francisco
1906 San Francisco earthquake, event.disaster.structures_destroyed, Balfour Guthrie and Co. San Francisco Office
m.09ytjk1, common.webpage.topic, San Francisco
Herb Caen's San Francisco: 1976-1991, book.written_work.subjects, San Francisco
San Francisco SEO, common.topic.subjects, San Francisco
San Francisco, common.topic.webpage, m.02kpz3y
San Francisco, common.topic.webpage, m.09y92wl
After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire, book.book.editions, After the ruins, 1906 and 2006 : rephotographing the San Francisco earthquake and fire
San Francisco, common.topic.article, m.0d6l_
San Francisco, book.book_subject.works, Mourners
San Francisco Mint (structure), event.disaster_affected_structure.survived_disasters, 1906 San Francisco earthquake
San Francisco, common.topic.webpage, m.022q122
San Francisco, common.topic.subject_of, San Francisco SEO
San Francisco, common.topic.article, m.0c1pb
The Great Earthquake and Firestorms of 1906, book.written_work.subjects, United States of America
San Francisco, common.topic.webpage, m.09y72nh
m.022q122, common.webpage.topic, San Francisco
http://www.sanfranciscosightseeing.com/, common.topic.subject_of, San Francisco
San Francisco, common.topic.webpage, m.09x4f_j
1906 San Francisco earthquake, event.disaster.survivors, Jack London
San Francisco, common.topic.webpage, m.09x1nxq
San Francisco, common.topic.webpage, m.0b46qyl
1906, book.written_work.subjects, San Francisco
Earthquake, event.disaster_type.disasters_of_this_type, 1906 San Francisco earthquake
San Francisco, book.book_subject.works, Further Tales of the City
After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire, book.written_work.author, Michael Lundgren
San Francisco, location.location.partially_contained_by, m.0wg9gvc
1906 San Francisco earthquake, common.topic.notable_for, g.1259pqvnv
m.0b46qyl, common.webpage.topic, San Francisco
San Francisco, common.topic.image, San Francisco
San Francisco, common.topic.webpage, m.09w8dlz
m.09x3sv5, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09wcrgb
San Francisco, location.location.adjoin_s, m.046cw9_
A Crack in the Edge of the World: America and the Great California Earthquake of 1906, book.book.editions, A crack in the edge of the world : America and the great California earthquake of 1906
m.09wcrgb, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09wm0d1
m.09y92wl, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09w8sgp
m.09wg_8f, common.webpage.topic, San Francisco
1906 San Francisco earthquake, time.event.start_date, 1906-04-18T05:12:00
San Francisco, common.topic.webpage, m.09wpzr3
San Francisco, base.biblioness.bibs_topic.subsumes, San Francisco
m.09ydswz, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.0b4827b
San Francisco, common.topic.notable_for, g.1259264lw
m.09ylkyw, common.webpage.topic, San Francisco
San Francisco, location.statistical_region.population, m.05tyd8l
San Francisco, common.topic.webpage, m.09xqp71
San Francisco, book.book_subject.works, The Basic Eight
1906 San Francisco earthquake, user.robert.earthquakes.earthquake.magnitude, m.02_w9xr
m.09yt_t_, common.webpage.topic, San Francisco
m.0bqsy6x, award.ranking.item, San Francisco
San Francisco, common.topic.webpage, m.09xhnkt
San Francisco, common.topic.webpage, m.0fpsk0j
San Francisco, location.statistical_region.population, m.05tyd86
San Francisco, book.book_subject.works, The Great Earthquake and Firestorms of 1906
1906 San Francisco earthquake, common.topic.image, Post-and-Grant-Avenue
A Crack in the Edge of the World: America and the Great California Earthquake of 1906, book.book.genre, Non-fiction
San Francisco, common.topic.webpage, m.09wjsz8
San Francisco, book.book_subject.works, 2nd Chance
San Francisco, book.book_subject.works, Fade to clear
m.09yj4m3, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09xzf2y
San Francisco, common.topic.webpage, m.09wlk8m
m.09y56v7, common.webpage.topic, San Francisco
San Francisco, common.topic.subject_of, Robin Duke
San Francisco, common.topic.webpage, m.0b48p4h
1906 San Francisco earthquake, event.disaster.damage, m.05bvd_b
m.09yv5y4, common.webpage.topic, San Francisco
San Francisco, location.statistical_region.rent50_1, m.05g9fk4
After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire, common.topic.notable_for, g.1256kn6_6
m.0b48bk0, common.webpage.topic, San Francisco
m.09ybmx4, common.webpage.topic, San Francisco
m.09xhnkt, common.webpage.topic, San Francisco
San Francisco, location.statistical_region.rent50_4, m.05g9fkt
m.09wtp55, common.webpage.topic, San Francisco
San Francisco, location.location.containedby, United States of America
After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire, book.book.genre, Coffee table book
1906 San Francisco earthquake, book.book_subject.works, A Crack in the Edge of the World: America and the Great California Earthquake of 1906
San Francisco, book.book_subject.works, 3rd Degree
m.09wq6jn, common.webpage.topic, San Francisco
m.09x44m3, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09xh6pb
San Francisco, common.topic.webpage, m.09w8m7x
San Francisco, common.topic.webpage, m.09wpgp4
m.0g_qdd6, common.webpage.topic, San Francisco
San Francisco, location.location.geolocation, m.0kb8zn
San Francisco, freebase.valuenotation.is_reviewed, Time zone(s)
San Francisco, book.book_subject.works, And the Sea Will Tell
m.09xh6pb, common.webpage.topic, San Francisco
m.09x5l82, common.webpage.topic, San Francisco
m.02kpz46, common.webpage.topic, San Francisco
Looking Down Sacramento Street, San Francisco, April 18, 1906, common.topic.article, m.025vy7q
San Francisco, common.topic.webpage, m.09xmh4d
m.09xqp71, common.webpage.topic, San Francisco
San Francisco, location.statistical_region.population, m.05tyd80
San Francisco, common.topic.webpage, m.09xjwn2
San Francisco, common.topic.webpage, m.09y204d
Earthquake, architecture.destruction_method.structures_destroyed, Balfour Guthrie and Co. San Francisco Office
San Francisco, common.topic.webpage, m.09wjmzw
Looking Down Sacramento Street, San Francisco, April 18, 1906, common.topic.notable_types, Artwork
San Francisco, location.location.events, 1906 San Francisco earthquake
San Francisco, common.topic.webpage, m.09ykksd
m.0b46t1y, common.webpage.topic, San Francisco
San Francisco, location.statistical_region.population, m.05tyd8d
San Francisco, common.topic.webpage, m.09ychf9
San Francisco, common.topic.webpage, m.09y9lh7
San Francisco, book.book_subject.works, Sister Noon
m.09ybqp0, common.webpage.topic, San Francisco
1906 San Francisco earthquake, common.topic.image, San Francisco Fire Sacramento Street 1906-04-18
San Francisco, common.topic.webpage, m.09y978r
A Crack in the Edge of the World: America and the Great California Earthquake of 1906, book.book.editions, A Crack in the Edge of the World: America and the Great California Earthquake of 1906
Balfour Guthrie and Co. San Francisco Office, event.disaster_affected_structure.destroyed_by_disaster, 1906 San Francisco earthquake
San Francisco, common.topic.webpage, m.09w6m0k
San Francisco, common.topic.webpage, m.09x44m3
m.09wz41k, common.webpage.topic, San Francisco
San Francisco, book.book_subject.works, Address unknown
m.09ytkc6, common.webpage.topic, San Francisco
m.09yb31v, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09y948d
Palace Hotel, San Francisco, architecture.structure.destroyed_by, Earthquake
m.09w6m0k, common.webpage.topic, San Francisco
Palace Hotel, San Francisco, event.disaster_affected_structure.survived_disasters, 1906 San Francisco earthquake
San Francisco, common.topic.webpage, m.09wf1j0
m.09y5c2z, common.webpage.topic, San Francisco
San Francisco, book.book_subject.works, Red Zone
Locked Rooms, book.written_work.subjects, 1906 San Francisco earthquake
San Francisco, location.statistical_region.rent50_2, m.05g9fkc
m.09ykr7w, common.webpage.topic, San Francisco
San Francisco, book.book_subject.works, The Barbary Coast
m.09y39v1, common.webpage.topic, San Francisco
m.0h2sfwg, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09ytkc6
1906 San Francisco earthquake, common.topic.notable_types, Disaster
1906 San Francisco earthquake, common.topic.article, m.01f6rx
San Francisco, book.book_subject.works, 1906
San Francisco, book.book_subject.works, Dead midnight
1906 San Francisco earthquake, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0098-949f
1906 San Francisco earthquake, user.robert.earthquakes.earthquake.duration, 60.0
San Francisco, common.topic.webpage, m.09w1w0k
1906 San Francisco earthquake, user.robert.earthquakes.earthquake.nearest_location, m.02_wb57
San Francisco, book.book_subject.works, Blue Light
m.09wjsz8, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.0b46t1y
m.09w8m7x, common.webpage.topic, San Francisco
San Francisco, book.book_subject.works, Hollow city
San Francisco, common.topic.webpage, m.03ll53z
1906 San Francisco earthquake, film.film_subject.films, San Francisco
m.09x70ns, common.webpage.topic, San Francisco
A Crack in the Edge of the World: America and the Great California Earthquake of 1906, common.topic.article, m.064g58h
A Crack in the Edge of the World: America and the Great California Earthquake of 1906, common.topic.notable_types, Book
San Francisco, common.topic.webpage, m.09y9t54
San Francisco, common.topic.webpage, m.0h2sfwg
San Francisco, common.topic.webpage, m.09wt6tt
San Francisco, book.book_subject.works, Nightcrawlers
m.09y60fg, common.webpage.topic, San Francisco
Looking Down Sacramento Street, San Francisco, April 18, 1906, base.newsevents.photograph.photographed_event, 1906 San Francisco earthquake
San Francisco, common.topic.webpage, m.0b48ht8
San Francisco, common.topic.webpage, m.09xk6vh
San Francisco, common.topic.webpage, m.09ydswz

Answer: 1906-04-18