He also devised an improved seismograph and created the field of geological prospecting using small, artificially-created earthquakes.
hiː ˈɔːlsoʊ dɪvˈaɪzd ɐn ɪmpɹˈuːvd sˈaɪzməɡɹˌæf ænd kɹiːˈeɪɾᵻd ðə fˈiːld ʌv dʒˌɪəlˈɑːdʒɪkəl pɹˈɑːspɛktɪŋ jˈuːzɪŋ smˈɔːl, ˌɑːɹɾɪfˈɪʃəlikɹiːˈeɪɾᵻd ˈɜːθkweɪks.